diff --git a/src/main/java/cn/cloudowr/dict/Controller.java b/src/main/java/cn/cloudowr/dict/Controller.java
index fc44ab8..39b5aae 100644
--- a/src/main/java/cn/cloudowr/dict/Controller.java
+++ b/src/main/java/cn/cloudowr/dict/Controller.java
@@ -12,6 +12,7 @@ import com.mongodb.client.result.UpdateResult;
 import org.bson.Document;
 import org.bson.conversions.Bson;
 import org.bson.types.ObjectId;
+import sdk.FastJSONUtil;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -44,11 +45,11 @@ public class Controller extends com.jfinal.core.Controller {
                 Filters.and(ops)
         ).into(documents);
 
-        List<String> json = new ArrayList<>();
-        documents.forEach(doc -> {
-            json.add(doc.toJson());
-        });
-        renderText(Arrays.toString(json.toArray()), ContentType.JSON);
+//        List<String> json = new ArrayList<>();
+//        documents.forEach(doc -> {
+//            json.add(FastJSONUtil.bsonToJSON(doc));
+//        });
+        renderJson(FastJSONUtil.bsonToJSON(documents));
     }
 
     public void dictList() {
@@ -59,11 +60,12 @@ public class Controller extends com.jfinal.core.Controller {
         List<Document> documents = new ArrayList<>();
         collection.find().limit(pageSize).skip(pageNum * pageSize).into(documents);
 
-        List<String> json = new ArrayList<>();
-        documents.forEach(doc -> {
-            json.add(doc.toJson());
-        });
-        renderText(Arrays.toString(json.toArray()), ContentType.JSON);
+//        List<String> json = new ArrayList<>();
+//        documents.forEach(doc -> {
+//            json.add(doc.toJson());
+//        });
+//        renderText(Arrays.toString(json.toArray()), ContentType.JSON);
+        renderJson(FastJSONUtil.bsonToJSON(documents));
     }
 
     public void addDict() {
@@ -81,7 +83,8 @@ public class Controller extends com.jfinal.core.Controller {
             }
         });
         getCollection().insertOne(dict);
-        renderJson(dict.toJson());
+//        renderJson(dict.toJson());
+        renderJson(FastJSONUtil.bsonToJSON(dict));
     }
 
     @Before(IdInterceptor.class)
diff --git a/src/main/java/sdk/FastJSONUtil.java b/src/main/java/sdk/FastJSONUtil.java
new file mode 100644
index 0000000..09f02d5
--- /dev/null
+++ b/src/main/java/sdk/FastJSONUtil.java
@@ -0,0 +1,17 @@
+package sdk;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.serializer.SerializeConfig;
+
+/**
+ * Created by lyf66 on 2017/2/18.
+ */
+public class FastJSONUtil {
+    private static ObjectIdSerializer serializer = new ObjectIdSerializer();
+
+    public static String bsonToJSON(Object object) {
+        SerializeConfig mapping = new SerializeConfig();
+        mapping.put(org.bson.types.ObjectId.class, serializer);
+        return JSON.toJSONString(object, mapping);
+    }
+}
diff --git a/src/main/java/sdk/ObjectIdSerializer.java b/src/main/java/sdk/ObjectIdSerializer.java
new file mode 100644
index 0000000..9df131e
--- /dev/null
+++ b/src/main/java/sdk/ObjectIdSerializer.java
@@ -0,0 +1,22 @@
+package sdk;
+
+import com.alibaba.fastjson.serializer.JSONSerializer;
+import com.alibaba.fastjson.serializer.ObjectSerializer;
+import org.bson.types.ObjectId;
+
+import java.io.IOException;
+import java.lang.reflect.Type;
+
+/**
+ * Created by lisai on 17/2/9.
+ */
+public class ObjectIdSerializer implements ObjectSerializer {
+    @Override
+    public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
+        if(object == null) {
+            serializer.getWriter().writeNull();
+        } else {
+            serializer.write(((ObjectId)object).toString());
+        }
+    }
+}