diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..88618c3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+/target
+.DS_Store
+.settings
+.project
+.classpath
diff --git a/dist/profile.properties b/dist/profile.properties
index e777020..0986555 100644
--- a/dist/profile.properties
+++ b/dist/profile.properties
@@ -1,3 +1,9 @@
+#log file name
+logFileName = tprofiler.log
+methodFileName = tmethod.log
+samplerFileName = tsampler.log
+
+#basic configuration items
 startProfTime = 9:00:00
 endProfTime = 11:00:00
 eachProfUseTime = 5
@@ -7,9 +13,13 @@ port = 50000
 debugMode = false
 needNanoTime = false
 ignoreGetSetMethod = true
-logFilePath = /home/admin/logs/tprofiler.log
-methodFilePath = /home/admin/logs/tmethod.log
-samplerFilePath = /home/admin/logs/tsampler.log
+
+#file paths
+logFilePath = ${user.home}/logs/${logFileName}
+methodFilePath = ${user.home}/logs/${methodFileName}
+samplerFilePath = ${user.home}/logs/${samplerFileName}
+
+#exclude & excludes items
 excludeClassLoader = org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader
 includePackageStartsWith = com.taobao;com.taobao.common
 excludePackageStartsWith = com.taobao.sketch;org.apache.velocity;com.alibaba;com.taobao.forest.domain.dataobject
diff --git a/dist/tprofiler.jar b/dist/tprofiler.jar
index c4a9678..6e899f4 100644
Binary files a/dist/tprofiler.jar and b/dist/tprofiler.jar differ
diff --git a/pom.xml b/pom.xml
index 442daf0..667e83f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,13 +12,19 @@
 			<artifactId>asm</artifactId>
 			<version>3.3.1</version>
 		</dependency>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.11</version>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-                <version>3.0</version>
+				<version>3.0</version>
 				<configuration>
 					<source>1.6</source>
 					<target>1.6</target>
@@ -28,7 +34,16 @@
 			<plugin>
 				<artifactId>maven-assembly-plugin</artifactId>
 				<version>2.2.2</version>
+				<executions>
+					<execution>
+						<phase>package</phase>
+						<goals>
+							<goal>assembly</goal>
+						</goals>
+					</execution>
+				</executions>
 				<configuration>
+					<appendAssemblyId>false</appendAssemblyId>
 					<descriptorRefs>
 						<descriptorRef>jar-with-dependencies</descriptorRef>
 					</descriptorRefs>
diff --git a/src/main/java/com/taobao/profile/Manager.java b/src/main/java/com/taobao/profile/Manager.java
index f5e61fc..83b8600 100644
--- a/src/main/java/com/taobao/profile/Manager.java
+++ b/src/main/java/com/taobao/profile/Manager.java
@@ -26,10 +26,6 @@
  * @since 2012-1-9
  */
 public class Manager {
-	/**
-	 * 默认配置文件
-	 */
-	private static final String DEFAULT_CONFIG = "profile";
 
 	/**
 	 * 远程连接端口
@@ -121,7 +117,7 @@ private Manager() {}
 	 * 初始化配置
 	 */
 	public void initialization() {
-		profConfig = new ProfConfig(DEFAULT_CONFIG);
+		profConfig = new ProfConfig();
 		NEED_NANO_TIME = profConfig.isNeedNanoTime();
 		IGNORE_GETSET_METHOD = profConfig.isIgnoreGetSetMethod();
 		METHOD_LOG_PATH = profConfig.getMethodFilePath();
diff --git a/src/main/java/com/taobao/profile/config/ConfigureProperties.java b/src/main/java/com/taobao/profile/config/ConfigureProperties.java
new file mode 100644
index 0000000..7008c60
--- /dev/null
+++ b/src/main/java/com/taobao/profile/config/ConfigureProperties.java
@@ -0,0 +1,236 @@
+package com.taobao.profile.config;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.io.PrintWriter;
+import java.io.Reader;
+import java.io.Writer;
+import java.util.Collection;
+import java.util.Enumeration;
+import java.util.InvalidPropertiesFormatException;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+
+import com.taobao.profile.utils.Utilities;
+import com.taobao.profile.utils.VariableNotFoundException;
+
+/**
+ * <p>用于加载配置文件的properties类，与java默认的不同，在调用get方法返回value时，会对value
+ * 会检查是否存在变量(如：${user.home})，如果存在，会将变量替换成具体的值。
+ * <p>该类使用dectorator设计模式
+ * 
+ * <p>示例文件内容(profile.properties)：
+ * <pre>
+ *   logFileName = tprofiler.log
+ *   methodFileName = tmethod.log
+ *   samplerFileName = tsampler.log
+ *   
+ *   startProfTime = 9:00:00
+ *   endProfTime = 11:00:00
+ *   eachProfUseTime = 5
+ *   eachProfIntervalTime = 50
+ *   samplerIntervalTime = 20
+ *   port = 50000
+ *   debugMode = false
+ *   needNanoTime = false
+ *   ignoreGetSetMethod = true
+ *   
+ *   logFilePath = ${user.home}/logs/${logFileName}
+ *   methodFilePath = ${user.home}/logs/${methodFileName}
+ *   samplerFilePath = ${user.home}/logs/${samplerFileName}
+ *   
+ *   excludeClassLoader = org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader
+ *   includePackageStartsWith = com.taobao;com.taobao.common
+ *   excludePackageStartsWith = com.taobao.sketch;org.apache.velocity;com.alibaba;com.taobao.forest.domain.dataobject
+ * </pre>
+ * <p>未例代码：
+ * <pre>
+ *   Properties properties = new Properties();
+ *   InputStream in = getClass().getClassLoader().getResourceAsStream("profile.properties");
+ *   properties.load(in);
+ *
+ *   Properties context = new Properties(System.getProperties());
+ *   context.putAll(System.getProperties());
+ *   context.putAll(properties);
+ *   try{
+ *     ConfigureProperties configureProperties = new ConfigureProperties(properties, context);
+ *     String logFilePath = configureProperties.getProperty("logFilePath");
+ *     Assert.assertEquals(logFilePath, System.getProperty("user.home") + "/logs/tprofiler.log");
+ *   }finally{
+ *     in.close();
+ *   }
+ * </pre>
+ * @author manlge
+ * @since 2013-08-18
+ */
+public class ConfigureProperties extends Properties {
+  
+  /**
+   * 
+   */
+  private static final long serialVersionUID = -3868173073422671544L;
+
+  private Properties delegate;
+  
+  private Properties context;
+  
+  
+  public ConfigureProperties(Properties delegate, Properties context) {
+    super();
+    this.delegate = delegate;
+    this.context = context;
+  }
+
+  public Object setProperty(String key, String value) {
+    return delegate.setProperty(key, value);
+  }
+
+  public void load(Reader reader) throws IOException {
+    delegate.load(reader);
+  }
+
+  public int size() {
+    return delegate.size();
+  }
+
+  public boolean isEmpty() {
+    return delegate.isEmpty();
+  }
+
+  public Enumeration<Object> keys() {
+    return delegate.keys();
+  }
+
+  public Enumeration<Object> elements() {
+    return delegate.elements();
+  }
+
+  public void load(InputStream inStream) throws IOException {
+    delegate.load(inStream);
+  }
+
+  public boolean contains(Object value) {
+    return delegate.contains(value);
+  }
+
+  public boolean containsValue(Object value) {
+    return delegate.containsValue(value);
+  }
+
+  public boolean containsKey(Object key) {
+    return delegate.containsKey(key);
+  }
+
+  public Object get(Object key) {
+    return delegate.get(key);
+  }
+
+  public Object put(Object key, Object value) {
+    return delegate.put(key, value);
+  }
+
+  public Object remove(Object key) {
+    return delegate.remove(key);
+  }
+
+  public void putAll(Map<? extends Object, ? extends Object> t) {
+    delegate.putAll(t);
+  }
+
+  public void clear() {
+    delegate.clear();
+  }
+
+  public Object clone() {
+    return delegate.clone();
+  }
+
+  public String toString() {
+    return delegate.toString();
+  }
+
+  public Set<Object> keySet() {
+    return delegate.keySet();
+  }
+
+  public Set<java.util.Map.Entry<Object, Object>> entrySet() {
+    return delegate.entrySet();
+  }
+
+  public void save(OutputStream out, String comments) {
+    delegate.save(out, comments);
+  }
+
+  public void store(Writer writer, String comments) throws IOException {
+    delegate.store(writer, comments);
+  }
+
+  public Collection<Object> values() {
+    return delegate.values();
+  }
+
+  public void store(OutputStream out, String comments) throws IOException {
+    delegate.store(out, comments);
+  }
+
+  public boolean equals(Object o) {
+    return delegate.equals(o);
+  }
+
+  public int hashCode() {
+    return delegate.hashCode();
+  }
+
+  public void loadFromXML(InputStream in) throws IOException,
+    InvalidPropertiesFormatException {
+    delegate.loadFromXML(in);
+  }
+
+  public void storeToXML(OutputStream os, String comment) throws IOException {
+    delegate.storeToXML(os, comment);
+  }
+
+  public void storeToXML(OutputStream os, String comment, String encoding)
+    throws IOException {
+    delegate.storeToXML(os, comment, encoding);
+  }
+
+  public String getProperty(String key) {
+    String value = delegate.getProperty(key);
+    try {
+      return Utilities.repleseVariables(value, context);
+    } catch (VariableNotFoundException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  public String getProperty(String key, String defaultValue) {
+    String value = delegate.getProperty(key, defaultValue);
+    try {
+      return Utilities.repleseVariables(value, context);
+    } catch (VariableNotFoundException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  public Enumeration<?> propertyNames() {
+    return delegate.propertyNames();
+  }
+
+  public Set<String> stringPropertyNames() {
+    return delegate.stringPropertyNames();
+  }
+
+  public void list(PrintStream out) {
+    delegate.list(out);
+  }
+
+  public void list(PrintWriter out) {
+    delegate.list(out);
+  }
+  
+  
+}
diff --git a/src/main/java/com/taobao/profile/config/ProfConfig.java b/src/main/java/com/taobao/profile/config/ProfConfig.java
index dcae38d..2c25c41 100644
--- a/src/main/java/com/taobao/profile/config/ProfConfig.java
+++ b/src/main/java/com/taobao/profile/config/ProfConfig.java
@@ -8,12 +8,17 @@
  */
 package com.taobao.profile.config;
 
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
 import java.io.File;
-import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
 import java.io.FileReader;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.Properties;
-import java.util.ResourceBundle;
+
+import com.taobao.profile.utils.VariableNotFoundException;
 
 /**
  * 读取并保存配置
@@ -22,6 +27,17 @@
  * @since 2010-6-22
  */
 public class ProfConfig {
+  
+  /**
+   * 配置文件名
+   */
+  private static final String CONFIG_FILE_NAME = "profile.properties";
+
+  /**
+   * 默认的配置文件路径，~/.tprofiler/profile.properties
+   */
+  private File DEFAULT_PROFILE_PATH = new File(System.getProperty("user.home"), "/.tprofiler/" + CONFIG_FILE_NAME);
+
 
 	/**
 	 * 开始profile时间
@@ -101,134 +117,144 @@ public class ProfConfig {
 	/**
 	 * 构造方法
 	 */
-	public ProfConfig(String defaultPath) {
-		String configPath = System.getProperty("profile.properties");
-		if (configPath == null || configPath.isEmpty()) {
-			parse(defaultPath);
-		} else {
-			File file = new File(configPath);
-			if (file.exists()) {
-				parseProperty(file);
-			} else {
-				parse(defaultPath);
-			}
+	public ProfConfig() {
+	  
+	  //此时配置文件中的debug参数还未读取，因此使用-Dtprofiler.debug=true来读取，用于开发时调试
+	  boolean debug = "true".equalsIgnoreCase(System.getProperty("tprofiler.debug")); 
+	  /*
+	   * 查找顺序：
+	   * 1. 系统参数-Dprofile.properties=/path/profile.properties
+	   * 2. 当前文件夹下的profile.properties
+	   * 3. 用户文件夹~/.tprofiler/profile.properties，如：/home/manlge/.tprofiler/profile.properties
+	   * 4. 默认jar包中的profile.properties
+	   */
+    File configFiles[] = {
+                            new File(System.getProperty(CONFIG_FILE_NAME)), 
+	                          new File(CONFIG_FILE_NAME), 
+	                          DEFAULT_PROFILE_PATH
+	                          };
+	  
+		for (File file : configFiles){
+	    if (file.exists() && file.isFile()) {
+        if (debug){
+          System.out.println(String.format("load configuration from \"%s\".", file.getAbsolutePath()));
+        }
+        parseProperty(file);
+        return;
+	    }
 		}
+		//加载默认配置
+    if (debug){
+      System.out.println(String.format("load configuration from \"%s\".", DEFAULT_PROFILE_PATH.getAbsolutePath()));
+    }
+    try {
+      extractDefaultProfile();
+      parseProperty(DEFAULT_PROFILE_PATH);
+    } catch (IOException e) {
+      throw new RuntimeException("error load config file " + DEFAULT_PROFILE_PATH, e);
+    }
+    
 	}
 
 	/**
+	 * 解压默认的配置文件到~/.tprofiler/profile.properties，作为模板，以便用户编辑
+	 * @throws IOException
+	 */
+	private void extractDefaultProfile() throws IOException {
+	  /*
+	   * 这里采用stream进行复制，而不是采用properties.load和save，主要原因为以下2点：
+	   * 1. 性能，stream直接复制快，没有properties解析过程(不过文件较小，解析开销可以忽略)
+	   * 2. properties会造成注释丢失，该文件作为模板提供给用户，包含注释信息
+	   */
+    InputStream in = new BufferedInputStream(getClass().getClassLoader().getResourceAsStream(CONFIG_FILE_NAME));
+    OutputStream out = null;
+    try{
+      File profileDirectory = DEFAULT_PROFILE_PATH.getParentFile();
+      if (!profileDirectory.exists()){
+        profileDirectory.mkdirs();
+      }
+      out = new BufferedOutputStream(new FileOutputStream(DEFAULT_PROFILE_PATH));
+      byte[] buffer = new byte[1024];
+      for (int len = -1; (len = in.read(buffer)) != -1;){
+        out.write(buffer, 0, len);
+      }
+    }finally{
+      in.close();
+      out.close();
+    }
+  }
+
+  /**
 	 * 解析用户自定义配置文件
-	 * 
 	 * @param path
 	 */
 	private void parseProperty(File path) {
-
-		Properties resource = new Properties();
+		Properties properties = new Properties();
 		try {
-			resource.load(new FileReader(path));
-			String startProfTime = resource.getProperty("startProfTime");
-			String endProfTime = resource.getProperty("endProfTime");
-			String logFilePath = resource.getProperty("logFilePath");
-			String methodFilePath = resource.getProperty("methodFilePath");
-			String samplerFilePath = resource.getProperty("samplerFilePath");
-			String includePackageStartsWith = resource.getProperty("includePackageStartsWith");
-			String eachProfUseTime = resource.getProperty("eachProfUseTime");
-			String eachProfIntervalTime = resource.getProperty("eachProfIntervalTime");
-			String samplerIntervalTime = resource.getProperty("samplerIntervalTime");
-			String excludePackageStartsWith = resource.getProperty("excludePackageStartsWith");
-			String needNanoTime = resource.getProperty("needNanoTime");
-			String ignoreGetSetMethod = resource.getProperty("ignoreGetSetMethod");
-			String excludeClassLoader = resource.getProperty("excludeClassLoader");
-			String debugMode = resource.getProperty("debugMode");
-            String port = resource.getProperty("port");
-            setPort(port == null ? 50000 : Integer.valueOf(port));
-			setDebugMode("true".equals(debugMode));
-			setExcludeClassLoader(excludeClassLoader);
-			setExcludePackageStartsWith(excludePackageStartsWith);
-			setEndProfTime(endProfTime);
-			setIncludePackageStartsWith(includePackageStartsWith);
-			setLogFilePath(logFilePath);
-			setMethodFilePath(methodFilePath);
-			setSamplerFilePath(samplerFilePath);
-			setStartProfTime(startProfTime);
-			setNeedNanoTime("true".equals(needNanoTime));
-			setIgnoreGetSetMethod("true".equals(ignoreGetSetMethod));
-			if (eachProfUseTime == null) {
-				setEachProfUseTime(5);
-			} else {
-				setEachProfUseTime(Integer.valueOf(eachProfUseTime.trim()));
-			}
-			if (eachProfIntervalTime == null) {
-				setEachProfIntervalTime(50);
-			} else {
-				setEachProfIntervalTime(Integer.valueOf(eachProfIntervalTime.trim()));
-			}
-			if (samplerIntervalTime == null) {
-				setSamplerIntervalTime(10);
-			} else {
-				setSamplerIntervalTime(Integer.valueOf(samplerIntervalTime.trim()));
-			}
-		} catch (FileNotFoundException e) {
-			e.printStackTrace();
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
-	}
-
-	/**
-	 * 解析默认配置文件
-	 * 
-	 * @param configName
-	 */
-	private void parse(String configName) {
-		try {
-			ResourceBundle resource = ResourceBundle.getBundle(configName);
-			String startProfTime = resource.getString("startProfTime");
-			String endProfTime = resource.getString("endProfTime");
-			String logFilePath = resource.getString("logFilePath");
-			String methodFilePath = resource.getString("methodFilePath");
-			String samplerFilePath = resource.getString("samplerFilePath");
-			String includePackageStartsWith = resource.getString("includePackageStartsWith");
-			String eachProfUseTime = resource.getString("eachProfUseTime");
-			String eachProfIntervalTime = resource.getString("eachProfIntervalTime");
-			String samplerIntervalTime = resource.getString("samplerIntervalTime");
-			String excludePackageStartsWith = resource.getString("excludePackageStartsWith");
-			String needNanoTime = resource.getString("needNanoTime");
-			String ignoreGetSetMethod = resource.getString("ignoreGetSetMethod");
-			String excludeClassLoader = resource.getString("excludeClassLoader");
-			String debugMode = resource.getString("debugMode");
-            String port = resource.getString("port");
-            setPort(port == null ? 50000 : Integer.valueOf(port));
-			setDebugMode("true".equals(debugMode));
-			setExcludeClassLoader(excludeClassLoader);
-			setExcludePackageStartsWith(excludePackageStartsWith);
-			setEndProfTime(endProfTime);
-			setIncludePackageStartsWith(includePackageStartsWith);
-			setLogFilePath(logFilePath);
-			setMethodFilePath(methodFilePath);
-			setSamplerFilePath(samplerFilePath);
-			setStartProfTime(startProfTime);
-			setNeedNanoTime("true".equals(needNanoTime));
-			setIgnoreGetSetMethod("true".equals(ignoreGetSetMethod));
-			if (eachProfUseTime == null) {
-				setEachProfUseTime(5);
-			} else {
-				setEachProfUseTime(Integer.valueOf(eachProfUseTime.trim()));
-			}
-			if (eachProfIntervalTime == null) {
-				setEachProfIntervalTime(50);
-			} else {
-				setEachProfIntervalTime(Integer.valueOf(eachProfIntervalTime.trim()));
-			}
-			if (samplerIntervalTime == null) {
-				setSamplerIntervalTime(10);
-			} else {
-				setSamplerIntervalTime(Integer.valueOf(samplerIntervalTime.trim()));
-			}
+			properties.load(new FileReader(path)); //配置文件原始内容，未进行变量替换
+			
+			//变量查找上下文，采用System.properties和配置文件集合
+			Properties context = new Properties(); 
+			context.putAll(System.getProperties());
+			context.putAll(properties);
+			
+			//加载配置
+      loadConfig(new ConfigureProperties(properties, context));
 		} catch (Exception e) {
 			e.printStackTrace();
 		}
 	}
 
+  /**
+   * 加载配置
+   * @param properties
+   */
+  private void loadConfig(Properties properties) throws VariableNotFoundException {
+    String startProfTime = properties.getProperty("startProfTime");
+    String endProfTime = properties.getProperty("endProfTime");
+    String logFilePath = properties.getProperty("logFilePath");
+    String methodFilePath = properties.getProperty("methodFilePath");
+    String samplerFilePath = properties.getProperty("samplerFilePath");
+    String includePackageStartsWith = properties.getProperty("includePackageStartsWith");
+    String eachProfUseTime = properties.getProperty("eachProfUseTime");
+    String eachProfIntervalTime = properties.getProperty("eachProfIntervalTime");
+    String samplerIntervalTime = properties.getProperty("samplerIntervalTime");
+    String excludePackageStartsWith = properties.getProperty("excludePackageStartsWith");
+    String needNanoTime = properties.getProperty("needNanoTime");
+    String ignoreGetSetMethod = properties.getProperty("ignoreGetSetMethod");
+    String excludeClassLoader = properties.getProperty("excludeClassLoader");
+    String debugMode = properties.getProperty("debugMode");
+          String port = properties.getProperty("port");
+          setPort(port == null ? 50000 : Integer.valueOf(port));
+    setDebugMode("true".equals(debugMode));
+    setExcludeClassLoader(excludeClassLoader);
+    setExcludePackageStartsWith(excludePackageStartsWith);
+    setEndProfTime(endProfTime);
+    setIncludePackageStartsWith(includePackageStartsWith);
+    setLogFilePath(logFilePath);
+    setMethodFilePath(methodFilePath);
+    setSamplerFilePath(samplerFilePath);
+    setStartProfTime(startProfTime);
+    setNeedNanoTime("true".equals(needNanoTime));
+    setIgnoreGetSetMethod("true".equals(ignoreGetSetMethod));
+    if (eachProfUseTime == null) {
+    	setEachProfUseTime(5);
+    } else {
+    	setEachProfUseTime(Integer.valueOf(eachProfUseTime.trim()));
+    }
+    if (eachProfIntervalTime == null) {
+    	setEachProfIntervalTime(50);
+    } else {
+    	setEachProfIntervalTime(Integer.valueOf(eachProfIntervalTime.trim()));
+    }
+    if (samplerIntervalTime == null) {
+    	setSamplerIntervalTime(10);
+    } else {
+    	setSamplerIntervalTime(Integer.valueOf(samplerIntervalTime.trim()));
+    }
+  }
+
+
 	/**
 	 * @return
 	 */
diff --git a/src/main/java/com/taobao/profile/utils/Utilities.java b/src/main/java/com/taobao/profile/utils/Utilities.java
new file mode 100644
index 0000000..a45a603
--- /dev/null
+++ b/src/main/java/com/taobao/profile/utils/Utilities.java
@@ -0,0 +1,64 @@
+/**
+ * (C) 2011-2012 Alibaba Group Holding Limited.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ * 
+ */
+
+package com.taobao.profile.utils;
+
+import java.util.Map;
+
+/**
+ * 提供常用的一些工具方法
+ * @author 刘永伟(manlge)
+ * @version 1.0
+ * @since 2013-08-18
+ */
+public class Utilities {
+
+  private Utilities() {
+  }
+  
+  /**
+   * 变量替换,将以${user.home}类似的变量替换成具体的值
+   * @param source 源字符串，如：${user.dir}/${user.language}/tprofiler.log
+   * @param context 上下文，用于查找变量的具体值
+   * @return 替换过的字符串
+   * @throws VariableNotFoundException
+   * @author manlge
+   */
+  public static String repleseVariables(String source, Map<Object, Object> context) throws VariableNotFoundException{
+    if (source == null){
+      throw new IllegalArgumentException("source can't be null");
+    }
+
+    if (context == null){
+      throw new IllegalArgumentException("context can't be null");
+    }
+
+    //从后向前查找    
+    int p = source.lastIndexOf('}');
+    while (p != -1){
+      int p1 = source.lastIndexOf("${");
+      //没有找到匹配
+      if (p1 == -1){
+        return source;
+      }
+      
+      String key = source.substring(p1 + 2, p); //+2 是跳过${
+      if (!context.containsKey(key)){
+        throw new VariableNotFoundException("variable " + key + " not found");
+      }
+      String value = String.valueOf(context.get(key));
+      String start = source.substring(0, p1);
+      String end = source.substring(p + 1);
+      source = start + value + end;
+      p = source.lastIndexOf('}');
+    }
+    
+    return source;
+  }
+}
diff --git a/src/main/java/com/taobao/profile/utils/VariableNotFoundException.java b/src/main/java/com/taobao/profile/utils/VariableNotFoundException.java
new file mode 100644
index 0000000..82f3568
--- /dev/null
+++ b/src/main/java/com/taobao/profile/utils/VariableNotFoundException.java
@@ -0,0 +1,31 @@
+package com.taobao.profile.utils;
+
+public class VariableNotFoundException extends Exception {
+
+  /**
+   * 
+   */
+  private static final long serialVersionUID = -1103164294134360436L;
+
+  public VariableNotFoundException() {
+    super();
+  }
+
+  public VariableNotFoundException(String message, Throwable cause,
+    boolean enableSuppression, boolean writableStackTrace) {
+    super(message, cause, enableSuppression, writableStackTrace);
+  }
+
+  public VariableNotFoundException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
+  public VariableNotFoundException(String message) {
+    super(message);
+  }
+
+  public VariableNotFoundException(Throwable cause) {
+    super(cause);
+  }
+
+}
diff --git a/src/main/resources/profile.properties b/src/main/resources/profile.properties
index e777020..0986555 100644
--- a/src/main/resources/profile.properties
+++ b/src/main/resources/profile.properties
@@ -1,3 +1,9 @@
+#log file name
+logFileName = tprofiler.log
+methodFileName = tmethod.log
+samplerFileName = tsampler.log
+
+#basic configuration items
 startProfTime = 9:00:00
 endProfTime = 11:00:00
 eachProfUseTime = 5
@@ -7,9 +13,13 @@ port = 50000
 debugMode = false
 needNanoTime = false
 ignoreGetSetMethod = true
-logFilePath = /home/admin/logs/tprofiler.log
-methodFilePath = /home/admin/logs/tmethod.log
-samplerFilePath = /home/admin/logs/tsampler.log
+
+#file paths
+logFilePath = ${user.home}/logs/${logFileName}
+methodFilePath = ${user.home}/logs/${methodFileName}
+samplerFilePath = ${user.home}/logs/${samplerFileName}
+
+#exclude & excludes items
 excludeClassLoader = org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader
 includePackageStartsWith = com.taobao;com.taobao.common
 excludePackageStartsWith = com.taobao.sketch;org.apache.velocity;com.alibaba;com.taobao.forest.domain.dataobject
diff --git a/src/test/java/com/taobao/profile/test/ConfigurePropertiesTest.java b/src/test/java/com/taobao/profile/test/ConfigurePropertiesTest.java
new file mode 100644
index 0000000..244f741
--- /dev/null
+++ b/src/test/java/com/taobao/profile/test/ConfigurePropertiesTest.java
@@ -0,0 +1,43 @@
+package com.taobao.profile.test;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Properties;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.taobao.profile.config.ConfigureProperties;
+
+public class ConfigurePropertiesTest {
+  
+  @Test
+  public void testConfigureProperties(){
+    Properties prop = new Properties();
+    prop.put("file.name", "tprofiler.log");
+    prop.put("log.file.path", "${user.home}/${file.name}");
+    Properties context = System.getProperties();
+    context.putAll(prop);
+    
+    Properties properties  = new ConfigureProperties(prop, context);
+    Assert.assertEquals(properties.getProperty("log.file.path"), System.getProperty("user.home") + "/tprofiler.log" );
+  }
+  
+  @Test
+  public void testConfigure() throws IOException{
+    Properties properties = new Properties();
+    InputStream in = getClass().getClassLoader().getResourceAsStream("profile.properties");
+    properties.load(in);
+
+    Properties context = new Properties(System.getProperties());
+    context.putAll(System.getProperties());
+    context.putAll(properties);
+    try{
+      ConfigureProperties configureProperties = new ConfigureProperties(properties, context);
+      String logFilePath = configureProperties.getProperty("logFilePath");
+      Assert.assertEquals(logFilePath, System.getProperty("user.home") + "/logs/tprofiler.log");
+    }finally{
+      in.close();
+    }
+  }
+}
diff --git a/src/test/java/com/taobao/profile/test/UtilitiesTest.java b/src/test/java/com/taobao/profile/test/UtilitiesTest.java
new file mode 100644
index 0000000..ac3fd13
--- /dev/null
+++ b/src/test/java/com/taobao/profile/test/UtilitiesTest.java
@@ -0,0 +1,18 @@
+package com.taobao.profile.test;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.taobao.profile.utils.Utilities;
+import com.taobao.profile.utils.VariableNotFoundException;
+
+public class UtilitiesTest{
+
+  @Test
+  public void testRepleseVariables() throws VariableNotFoundException{
+    String source = "${user.home}/logs/${user.language}/tprofiler.log";
+    String str1 = Utilities.repleseVariables(source, System.getProperties());
+    String str2 = System.getProperty("user.home") + "/logs/" + System.getProperty("user.language") + "/tprofiler.log";  
+    Assert.assertEquals(str1, str2);
+  }
+}