diff --git a/src/__xml4nlp/Xml4nlp.cpp b/src/__xml4nlp/Xml4nlp.cpp
index 527334bc6..b51fee039 100644
--- a/src/__xml4nlp/Xml4nlp.cpp
+++ b/src/__xml4nlp/Xml4nlp.cpp
@@ -859,7 +859,14 @@ int XML4NLP::SetParsesToSentence(const vector<int> &vecHead, const vector<string
 
 int XML4NLP::SetParsesToSentence(const vector<int> &vecHead, const vector<string> &vecRel, int sentenceIdx)
 {
-    if (0 != SetInfoToSentence(vecHead, sentenceIdx, TAG_PSR_PARENT)) return -1;
+    // decreasing vecHead index
+    vector<int> d_vecHead;
+    for (int i = 0; i < vecHead.size(); i++)
+    {
+        d_vecHead.push_back(vecHead[i] - 1);
+    }
+
+    if (0 != SetInfoToSentence(d_vecHead, sentenceIdx, TAG_PSR_PARENT)) return -1;
     if (0 != SetInfoToSentence(vecRel, sentenceIdx, TAG_PSR_RELATE)) return -1;
     return 0;
 }
diff --git a/src/parser/parser_dll.cpp b/src/parser/parser_dll.cpp
index 8fc3e1d6a..cd1c778d8 100644
--- a/src/parser/parser_dll.cpp
+++ b/src/parser/parser_dll.cpp
@@ -56,7 +56,7 @@ class ParserWrapper : public ltp::parser::Parser {
         heads.resize(len - 1);
         deprels.resize(len - 1);
         for (int i = 1; i < len; ++ i) {
-            heads[i - 1] = inst->predicted_heads[i] - 1;
+            heads[i - 1] = inst->predicted_heads[i];
             deprels[i - 1] = ltp::parser::Parser::model->deprels.at(
                     inst->predicted_deprelsidx[i]);
         }