diff --git a/json/build.go b/json/build.go
index c6cdeba..3002cd0 100644
--- a/json/build.go
+++ b/json/build.go
@@ -199,8 +199,14 @@ func (dj *DynamicJSON) getValFormat(root *JSONode) string {
 		}
 
 		if root.IsHasLastBrother {
+			if root.IsString {
+				return key + ":\"%v\","
+			}
 			return key + ":%v,"
 		}
+		if root.IsString {
+			return key + ":\"%v\""
+		}
 		return key + ":%v"
 	}
 
@@ -209,10 +215,15 @@ func (dj *DynamicJSON) getValFormat(root *JSONode) string {
 		return ""
 	}
 	if root.IsHasLastBrother {
+		if root.IsString {
+			return "\"%v\","
+		}
 		return "%v,"
 	}
+	if root.IsString {
+		return "\"%v\""
+	}
 	return "%v"
-
 }
 
 // getStartSymbol 计算起始的符号
diff --git a/json/json_test.go b/json/json_test.go
index c38590c..3649588 100644
--- a/json/json_test.go
+++ b/json/json_test.go
@@ -29,6 +29,7 @@ func TestJSON(t *testing.T) {
 	tree.SetValue("good.price", "180", false)
 	tree.SetValue("good.unit", "$", false)
 	tree.SetValue("slice.[0].name", "zhang", false)
+	tree.SetValue("slice.[0].age", 30, false)
 	tree.SetValue("slice.[1].name", "de", false)
 	tree.SetValue("slice.[2].name", "man", false)
 	tree.SetValue("slice.[3]", "zhangdeman", false)