diff --git a/broker/src/main/java/com/xiaoleilu/loServer/action/admin/AdminAction.java b/broker/src/main/java/com/xiaoleilu/loServer/action/admin/AdminAction.java
index 4f84956a..807e4d03 100644
--- a/broker/src/main/java/com/xiaoleilu/loServer/action/admin/AdminAction.java
+++ b/broker/src/main/java/com/xiaoleilu/loServer/action/admin/AdminAction.java
@@ -59,7 +59,7 @@ abstract public class AdminAction extends Action {
         }
         
         if (StringUtil.isNullOrEmpty(nonce) || StringUtil.isNullOrEmpty(timestamp) || StringUtil.isNullOrEmpty(sign)) {
-            return ErrorCode.INVALID_PARAMETER;
+            return ErrorCode.ERROR_CODE_API_NOT_SIGNED;
         }
 
         Long ts;
@@ -68,7 +68,7 @@ abstract public class AdminAction extends Action {
         } catch (Exception e) {
             e.printStackTrace();
             Utility.printExecption(LOG, e);
-            return ErrorCode.INVALID_PARAMETER;
+            return ErrorCode.ERROR_CODE_API_NOT_SIGNED;
         }
 
         if (!NO_CHECK_TIME && System.currentTimeMillis() - ts > 2 * 60 * 60 * 1000) {
diff --git a/broker/src/main/java/com/xiaoleilu/loServer/action/channel/ChannelAction.java b/broker/src/main/java/com/xiaoleilu/loServer/action/channel/ChannelAction.java
index 61b92b68..978dc27d 100644
--- a/broker/src/main/java/com/xiaoleilu/loServer/action/channel/ChannelAction.java
+++ b/broker/src/main/java/com/xiaoleilu/loServer/action/channel/ChannelAction.java
@@ -51,7 +51,7 @@ abstract public class ChannelAction extends Action {
         }
 
         if (StringUtil.isNullOrEmpty(nonce) || StringUtil.isNullOrEmpty(timestamp) || StringUtil.isNullOrEmpty(sign) || StringUtil.isNullOrEmpty(cid)) {
-            return ErrorCode.INVALID_PARAMETER;
+            return ErrorCode.ERROR_CODE_API_NOT_SIGNED;
         }
 
         if (!mLimitCounter.isGranted(cid)) {
@@ -64,7 +64,7 @@ abstract public class ChannelAction extends Action {
         } catch (Exception e) {
             e.printStackTrace();
             Utility.printExecption(LOG, e, IMExceptionEvent.EventType.CHANNEL_API_Exception);
-            return ErrorCode.INVALID_PARAMETER;
+            return ErrorCode.ERROR_CODE_API_NOT_SIGNED;
         }
 
         if (System.currentTimeMillis() - ts > 2 * 60 * 60 * 1000) {
diff --git a/broker/src/main/java/com/xiaoleilu/loServer/action/robot/RobotAction.java b/broker/src/main/java/com/xiaoleilu/loServer/action/robot/RobotAction.java
index 3dbf5ca6..d608e158 100644
--- a/broker/src/main/java/com/xiaoleilu/loServer/action/robot/RobotAction.java
+++ b/broker/src/main/java/com/xiaoleilu/loServer/action/robot/RobotAction.java
@@ -55,7 +55,7 @@ abstract public class RobotAction extends Action {
         }
 
         if (StringUtil.isNullOrEmpty(nonce) || StringUtil.isNullOrEmpty(timestamp) || StringUtil.isNullOrEmpty(sign) || StringUtil.isNullOrEmpty(rid)) {
-            return ErrorCode.INVALID_PARAMETER;
+            return ErrorCode.ERROR_CODE_API_NOT_SIGNED;
         }
 
         if (!mLimitCounter.isGranted(rid)) {
@@ -68,7 +68,7 @@ abstract public class RobotAction extends Action {
         } catch (Exception e) {
             e.printStackTrace();
             Utility.printExecption(LOG, e, IMExceptionEvent.EventType.ROBOT_API_Exception);
-            return ErrorCode.INVALID_PARAMETER;
+            return ErrorCode.ERROR_CODE_API_NOT_SIGNED;
         }
 
         if (System.currentTimeMillis() - ts > 2 * 60 * 60 * 1000) {
diff --git a/common/src/main/java/cn/wildfirechat/common/ErrorCode.java b/common/src/main/java/cn/wildfirechat/common/ErrorCode.java
index 7e697cde..6b4905db 100755
--- a/common/src/main/java/cn/wildfirechat/common/ErrorCode.java
+++ b/common/src/main/java/cn/wildfirechat/common/ErrorCode.java
@@ -42,6 +42,7 @@ public enum ErrorCode {
 
     ERROR_CODE_RECALL_TIME_EXPIRED(24, "time expired"),
 
+    ERROR_CODE_API_NOT_SIGNED(239, "api not signed or sign parameter not completion"),
     ERROR_CODE_GROUP_EXCEED_MAX_MEMBER_COUNT(240, "group exceed max member count"),
     ERROR_CODE_GROUP_MUTED(241, "group is muted"),
     ERROR_CODE_SENSITIVE_MATCHED(242, "sensitive matched"),