diff --git a/json/build.go b/json/build.go
index 469b8c5..467aad4 100644
--- a/json/build.go
+++ b/json/build.go
@@ -200,7 +200,14 @@ func (dj *DynamicJSON) getValFormat(root *JSONode) string {
 //
 // Date : 12:21 下午 2021/3/13
 func (dj *DynamicJSON) getStartSymbol(root *JSONode) string {
-	if nil == root || root.IsRoot {
+	if nil == root {
+		return "{"
+	}
+
+	if root.IsRoot {
+		if root.IsSlice {
+			return "["
+		}
 		return "{"
 	}
 	key := fmt.Sprintf("\"%s\"", root.Key)
diff --git a/json/json_test.go b/json/json_test.go
index e99b9f5..4858152 100644
--- a/json/json_test.go
+++ b/json/json_test.go
@@ -33,6 +33,11 @@ func TestJSON(t *testing.T) {
 	tree.SetValue("slice.[2].name", "man")
 	tree.SetValue("slice.[3]", "zhangdeman")
 	fmt.Println(tree.String())
+	tree = NewDynamicJSON()
+	tree.SetValue("[0]", "zhang")
+	tree.SetValue("[1]", "de")
+	tree.SetValue("[2]", "man")
+	fmt.Println(tree.String())
 }
 
 // TestType 判断数据类型断言