diff --git a/broker/migrate/h2/V52__modify_message_target.sql b/broker/migrate/h2/V52__modify_message_target.sql
new file mode 100755
index 00000000..16704122
--- /dev/null
+++ b/broker/migrate/h2/V52__modify_message_target.sql
@@ -0,0 +1 @@
+alter table `t_messages` modify column `_target` varchar(129) NOT NULL;
diff --git a/broker/migrate/mysql/V60__modify_messages_target.sql b/broker/migrate/mysql/V60__modify_messages_target.sql
new file mode 100755
index 00000000..c8b0ded2
--- /dev/null
+++ b/broker/migrate/mysql/V60__modify_messages_target.sql
@@ -0,0 +1,37 @@
+alter table `t_messages` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_0` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_1` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_2` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_3` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_4` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_5` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_6` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_7` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_8` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_9` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_10` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_11` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_12` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_13` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_14` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_15` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_16` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_17` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_18` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_19` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_20` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_21` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_22` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_23` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_24` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_25` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_26` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_27` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_28` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_29` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_30` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_31` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_32` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_33` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_34` modify column `_target` varchar(129) NOT NULL;
+alter table `t_messages_35` modify column `_target` varchar(129) NOT NULL;
diff --git a/common/src/main/java/cn/wildfirechat/common/APIPath.java b/common/src/main/java/cn/wildfirechat/common/APIPath.java
index e472e914..01a30774 100644
--- a/common/src/main/java/cn/wildfirechat/common/APIPath.java
+++ b/common/src/main/java/cn/wildfirechat/common/APIPath.java
@@ -139,6 +139,7 @@ public interface APIPath {
     String Robot_User_Info = "/robot/user_info";
     String Robot_Get_Profile = "/robot/profile";
     String Robot_Message_Send = "/robot/message/send";
+    String Robot_Message_Reply = "/robot/message/reply";
     String Robot_Message_Recall = "/robot/message/recall";
     String Robot_Message_Update = "/robot/message/update";
     String Robot_Set_Callback = "/robot/set_callback";
diff --git a/common/src/main/java/cn/wildfirechat/pojos/ReplyMessageData.java b/common/src/main/java/cn/wildfirechat/pojos/ReplyMessageData.java
new file mode 100644
index 00000000..3a215c78
--- /dev/null
+++ b/common/src/main/java/cn/wildfirechat/pojos/ReplyMessageData.java
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the Wildfire Chat package.
+ * (c) Heavyrain2012 <heavyrain.lee@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+package cn.wildfirechat.pojos;
+
+import cn.wildfirechat.proto.WFCMessage;
+import io.netty.util.internal.StringUtil;
+
+import java.util.List;
+
+public class ReplyMessageData {
+    private long messageUid;
+    private MessagePayload payload;
+    private boolean only2Sender;
+
+    public long getMessageUid() {
+        return messageUid;
+    }
+
+    public void setMessageUid(long messageUid) {
+        this.messageUid = messageUid;
+    }
+
+    public MessagePayload getPayload() {
+        return payload;
+    }
+
+    public void setPayload(MessagePayload payload) {
+        this.payload = payload;
+    }
+
+    public boolean isOnly2Sender() {
+        return only2Sender;
+    }
+
+    public void setOnly2Sender(boolean only2Sender) {
+        this.only2Sender = only2Sender;
+    }
+
+    public static boolean isValide(ReplyMessageData sendMessageData) {
+        if(sendMessageData.messageUid <=0  ||
+            sendMessageData.getPayload() == null) {
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/sdk/src/main/java/cn/wildfirechat/sdk/RobotService.java b/sdk/src/main/java/cn/wildfirechat/sdk/RobotService.java
index 91abc61a..e17a8d15 100644
--- a/sdk/src/main/java/cn/wildfirechat/sdk/RobotService.java
+++ b/sdk/src/main/java/cn/wildfirechat/sdk/RobotService.java
@@ -39,6 +39,15 @@ public class RobotService implements Closeable {
         return robotHttpUtils.httpJsonPost(path, messageData, SendMessageResult.class);
     }
 
+    public IMResult<SendMessageResult> replyMessage(long messageUid, MessagePayload payload, boolean only2Sender) throws Exception {
+        String path = APIPath.Robot_Message_Reply;
+        ReplyMessageData messageData = new ReplyMessageData();
+        messageData.setMessageUid(messageUid);
+        messageData.setOnly2Sender(only2Sender);
+        messageData.setPayload(payload);
+        return robotHttpUtils.httpJsonPost(path, messageData, SendMessageResult.class);
+    }
+
     public IMResult<String> recallMessage(long messageUid) throws Exception {
         String path = APIPath.Robot_Message_Recall;
         RecallMessageData messageData = new RecallMessageData();