diff --git a/platformapi/dingdingapi/callback.go b/platformapi/dingdingapi/callback.go
index d34e4a59..89175e24 100644
--- a/platformapi/dingdingapi/callback.go
+++ b/platformapi/dingdingapi/callback.go
@@ -103,7 +103,7 @@ func (a *API) Encrypt(msg string) (encryptedMsg string, err error) {
 	binary.Write(buf, binary.BigEndian, int32(len(msg)))
 	buf.WriteString(msg)
 	buf.WriteString(a.corpID)
-	binResult, err := utils.AESCBCEncpryt(buf.Bytes(), aesKey, aesKey[:16])
+	binResult, err := utils.AESCBCEncpryt(buf.Bytes(), aesKey, []byte(a.corpID[:16]))
 	encryptedMsg = base64.StdEncoding.EncodeToString(binResult)
 	return encryptedMsg, err
 }