diff --git a/model.go b/model.go
index 1a178196..21628eb3 100644
--- a/model.go
+++ b/model.go
@@ -133,30 +133,6 @@ type Index struct {
 	LogReduceBlackListDict []string            `json:"log_reduce_black_list,omitempty"`
 }
 
-func (u *Index) MarshalJSON() ([]byte, error) {
-	rst := make(map[string]interface{})
-	rst["log_reduce"] = u.LogReduce
-	if len(u.Keys) > 0 {
-		rst["keys"] = u.Keys
-	}
-	if u.Line != nil {
-		rst["line"] = u.Line
-	}
-	if u.Ttl > 0 {
-		rst["ttl"] = u.Ttl
-	}
-	if u.MaxTextLen > 0 {
-		rst["max_text_len"] = u.MaxTextLen
-	}
-	if len(u.LogReduceWhiteListDict) > 0 {
-		rst["log_reduce_white_list"] = u.LogReduceWhiteListDict
-	}
-	if len(u.LogReduceBlackListDict) > 0 {
-		rst["log_reduce_black_list"] = u.LogReduceBlackListDict
-	}
-	return json.Marshal(rst)
-}
-
 // CreateDefaultIndex return a full text index config
 func CreateDefaultIndex() *Index {
 	return &Index{
diff --git a/model_test.go b/model_test.go
index e2d12f29..f6d5662d 100644
--- a/model_test.go
+++ b/model_test.go
@@ -9,6 +9,7 @@ import (
 )
 
 func TestIndex_MarshalJSON(t *testing.T) {
+
 	type fields struct {
 		Keys                   map[string]IndexKey
 		Line                   *IndexLine
@@ -39,7 +40,7 @@ func TestIndex_MarshalJSON(t *testing.T) {
 				Ttl:        2,
 				MaxTextLen: 3,
 			},
-			want: []byte(`{"log_reduce":false,"max_text_len":3,"ttl":2}`),
+			want: []byte(`{"ttl":2,"max_text_len":3,"log_reduce":false}`),
 		},
 		{
 			name: "white & black",
@@ -48,7 +49,7 @@ func TestIndex_MarshalJSON(t *testing.T) {
 				LogReduceBlackListDict: []string{"key2"},
 				LogReduce:              true,
 			},
-			want: []byte(`{"log_reduce":true,"log_reduce_black_list":["key2"],"log_reduce_white_list":["key1"]}`),
+			want: []byte(`{"log_reduce":true,"log_reduce_white_list":["key1"],"log_reduce_black_list":["key2"]}`),
 		},
 	}
 	for _, tt := range tests {
@@ -67,4 +68,5 @@ func TestIndex_MarshalJSON(t *testing.T) {
 			assert.Equalf(t, tt.want, got, "MarshalJSON()")
 		})
 	}
+
 }