diff --git a/README.md b/README.md
index 5056c23..cd499c5 100644
--- a/README.md
+++ b/README.md
@@ -63,13 +63,13 @@ package main
 import (
 	"log"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
 var (
 	// searcher is coroutine safe
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 func main() {
diff --git a/README_zh.md b/README_zh.md
index 7339b34..19d7ae4 100755
--- a/README_zh.md
+++ b/README_zh.md
@@ -64,13 +64,13 @@ package main
 import (
 	"log"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
 var (
 	// searcher 是协程安全的
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 func main() {
diff --git a/data/riot/main.go b/data/riot/main.go
index 0b43efe..50c35f5 100644
--- a/data/riot/main.go
+++ b/data/riot/main.go
@@ -23,14 +23,14 @@ import (
 	rpc "github.com/go-ego/riot/net/grpc"
 	rhttp "github.com/go-ego/riot/net/http"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-vgo/gt/conf"
 	"github.com/go-vgo/gt/zlog"
 )
 
 var (
 	// searcher is coroutine safe
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 // var config rpc.Config
diff --git a/data/riot1/main.go b/data/riot1/main.go
index 480778e..dede495 100644
--- a/data/riot1/main.go
+++ b/data/riot1/main.go
@@ -22,14 +22,14 @@ import (
 	rpc "github.com/go-ego/riot/net/grpc"
 	rhttp "github.com/go-ego/riot/net/http"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-vgo/gt/conf"
 	"github.com/go-vgo/gt/zlog"
 )
 
 var (
 	// searcher is coroutine safe
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 var config com.Config
diff --git a/docs/zh/codelab.md b/docs/zh/codelab.md
index c719901..e6f9308 100755
--- a/docs/zh/codelab.md
+++ b/docs/zh/codelab.md
@@ -56,14 +56,14 @@ type Weibo struct {
 
 ```go
 import (
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 ```
 第一个包定义了引擎功能，第二个包定义了常用结构体。在使用引擎之前需要初始化，例如
 
 ```go
-var searcher engine.Engine
+var searcher riot.Engine
 searcher.Init(types.EngineInitOptions{
 	SegmenterDict: "../../data/dict/dictionary.txt",
 	StopTokenFile:         "../../data/dict/stop_tokens.txt",
@@ -184,11 +184,12 @@ response := searcher.Search(types.SearchRequest{
 
 如果你想进一步了解riot 引擎，建议你直接阅读代码。代码的目录结构如下：
 
-    /core       核心部件，包括索引器和排序器
-    /data       字典文件和停用词文件
-    /docs       文档
-    /engine     引擎，包括主协程、分词协程、索引器协程和排序器协程的实现
-    /examples   例子和性能测试程序
-    /testdata   测试数据
-    /types      常用结构体
-    /utils      常用函数
+    riot/           引擎，包括主协程、分词协程、索引器协程和排序器协程的实现
+        /core       核心部件，包括索引器和排序器
+        /data       字典文件和停用词文件
+        /docs       文档
+        /engine     引擎，包括主协程、分词协程、索引器协程和排序器协程的实现, 已移到主目录
+        /examples   例子和性能测试程序
+        /testdata   测试数据
+        /types      常用结构体
+        /utils      常用函数
diff --git a/docs/zh/custom_scoring_criteria.md b/docs/zh/custom_scoring_criteria.md
index c2cbffe..c264d30 100755
--- a/docs/zh/custom_scoring_criteria.md
+++ b/docs/zh/custom_scoring_criteria.md
@@ -29,7 +29,7 @@ func (criteria MyScoringCriteria) Score(
 }
 ```
 
-文档的MyScoringFields数据通过engine.Engine的IndexDocument函数传给排序器保存在内存中。然后通过Search函数的参数调用MyScoringCriteria进行查询。
+文档的MyScoringFields数据通过 riot.Engine 的 IndexDocument 函数传给排序器保存在内存中。然后通过Search函数的参数调用 MyScoringCriteria 进行查询。
 
 当然，MyScoringCriteria的Score函数也可以通过docId从硬盘或数据库读取更多文档数据用于打分，但速度要比从内存中直接读慢许多，请在内存和速度之间合适取舍。
 
diff --git a/examples/benchmark/benchmark.go b/examples/benchmark/benchmark.go
index 509a01a..4bc964e 100755
--- a/examples/benchmark/benchmark.go
+++ b/examples/benchmark/benchmark.go
@@ -13,7 +13,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
@@ -49,7 +49,7 @@ var (
 	storageEngine           = flag.String("storageEngine", "lbd", "use StorageEngine")
 	persistentStorageShards = flag.Int("persistentStorageShards", 0, "持久数据库存储裂分数目")
 
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 	options  = types.RankOptions{
 		OutputOffset: 0,
 		MaxOutputs:   100,
@@ -202,7 +202,7 @@ func main() {
 	if *usePersistent {
 		searcher.Close()
 		t6 := time.Now()
-		searcher1 := engine.Engine{}
+		searcher1 := riot.Engine{}
 		searcher1.Init(types.EngineInitOptions{
 			SegmenterDict: *dictionaries,
 			StopTokenFile: *stopTokenFile,
diff --git a/examples/codelab/search_server.go b/examples/codelab/search_server.go
index b8e6ce4..7f4d60c 100755
--- a/examples/codelab/search_server.go
+++ b/examples/codelab/search_server.go
@@ -15,7 +15,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
@@ -27,7 +27,7 @@ const (
 )
 
 var (
-	searcher      = engine.Engine{}
+	searcher      = riot.Engine{}
 	wbs           = map[uint64]Weibo{}
 	weiboData     = flag.String("weibo_data", "../../testdata/weibo_data.txt", "微博数据文件")
 	dictFile      = flag.String("dict_file", "../../data/dict/dictionary.txt", "词典文件")
diff --git a/examples/logic/main.go b/examples/logic/main.go
index 6c264ea..2ada9e6 100644
--- a/examples/logic/main.go
+++ b/examples/logic/main.go
@@ -17,13 +17,13 @@ package main
 import (
 	"log"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
 var (
 	// searcher is coroutine safe
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 func main() {
diff --git a/examples/pinyin/main.go b/examples/pinyin/main.go
index 1439378..fffde2c 100644
--- a/examples/pinyin/main.go
+++ b/examples/pinyin/main.go
@@ -18,13 +18,13 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
 var (
 	// searcher是协程安全的
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 func initEngine() {
diff --git a/examples/pinyin_weibo/main.go b/examples/pinyin_weibo/main.go
index 0b15bfb..0de5dae 100644
--- a/examples/pinyin_weibo/main.go
+++ b/examples/pinyin_weibo/main.go
@@ -12,7 +12,7 @@ import (
 	"os"
 	"os/signal"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
@@ -24,7 +24,7 @@ const (
 )
 
 var (
-	searcher      = engine.Engine{}
+	searcher      = riot.Engine{}
 	wbs           = map[uint64]Weibo{}
 	weiboData     = flag.String("weibo_data", "weibo.txt", "微博数据文件")
 	dictFile      = flag.String("dict_file", "../../data/dict/dictionary.txt", "词典文件")
diff --git a/examples/simple/main.go b/examples/simple/main.go
index 1a8079e..feff906 100644
--- a/examples/simple/main.go
+++ b/examples/simple/main.go
@@ -17,13 +17,13 @@ package main
 import (
 	"log"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
 var (
 	// searcher is coroutine safe
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 func main() {
diff --git a/examples/simple/zh/main.go b/examples/simple/zh/main.go
index c10c187..88d66c5 100755
--- a/examples/simple/zh/main.go
+++ b/examples/simple/zh/main.go
@@ -9,13 +9,13 @@ package main
 import (
 	"log"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
 var (
 	// searcher 是线程安全的
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 func main() {
diff --git a/examples/store/main.go b/examples/store/main.go
index 83946bf..9e01b00 100644
--- a/examples/store/main.go
+++ b/examples/store/main.go
@@ -19,13 +19,13 @@ import (
 	"log"
 	"os"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
 var (
 	// searcher is coroutine safe
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 )
 
 func initEngine() {
diff --git a/examples/weibo/custom_scoring_criteria.go b/examples/weibo/custom_scoring_criteria.go
index e995165..1c74a26 100755
--- a/examples/weibo/custom_scoring_criteria.go
+++ b/examples/weibo/custom_scoring_criteria.go
@@ -23,7 +23,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 )
 
@@ -52,7 +52,7 @@ var (
 		"../../data/dict/stop_tokens.txt",
 		"停用词文件")
 
-	searcher = engine.Engine{}
+	searcher = riot.Engine{}
 	options  = types.RankOptions{
 		ScoringCriteria: WeiboScoringCriteria{},
 		OutputOffset:    0,
diff --git a/net/com/search.go b/net/com/search.go
index abdd69b..191c881 100644
--- a/net/com/search.go
+++ b/net/com/search.go
@@ -18,14 +18,14 @@ import (
 	"log"
 	"os"
 
-	"github.com/go-ego/riot/engine"
+	"github.com/go-ego/riot"
 	"github.com/go-ego/riot/types"
 	// "github.com/go-vgo/gt/zlog"
 )
 
 var (
 	// Searcher is coroutine safe
-	Searcher = engine.Engine{}
+	Searcher = riot.Engine{}
 	// Conf is config
 	Conf Config
 )