diff --git a/platformapi/dingdingapi/message.go b/platformapi/dingdingapi/message.go
index 6598ae5e..edfe0c81 100644
--- a/platformapi/dingdingapi/message.go
+++ b/platformapi/dingdingapi/message.go
@@ -2,6 +2,10 @@ package dingdingapi
 
 import "strings"
 
+const (
+	MaxWorkMsgLen = 2048
+)
+
 func (a *API) CorpAsyncSend(userIDList, deptIDList []string, isToAllUser bool, msg map[string]interface{}) (err error) {
 	params := map[string]interface{}{
 		"agent_id": a.agentID,