diff --git a/config/config.yaml b/config/config.yaml
index 61aadf2b3..7980eaa6f 100644
--- a/config/config.yaml
+++ b/config/config.yaml
@@ -36,7 +36,7 @@ mongo:
   dbPassword:   #mongo密码，建议先不设置
   dbMaxPoolSize: 100
   dbRetainChatRecords: 3650 #mongo保存离线消息时间（天），根据需求修改
-  chatRecordsClearTime: "* * * * *" # 每天凌晨3点清除消息，该配置和linux定时任务一样， 清理操作建议设置在用户活跃少的时候 # 0 3 * * *
+  chatRecordsClearTime: "0 3 * * *" # 每天凌晨3点清除消息，该配置和linux定时任务一样， 清理操作建议设置在用户活跃少的时候 # 0 3 * * *
 
 redis:
   dbAddress: [ 127.0.0.1:16379 ] #redis地址 单机时，填写一个地址即可，使用redis集群时候，填写集群中多个节点地址（主从地址都可以填写，增加容灾能力），默认即可
diff --git a/internal/cron_task/clear_msg.go b/internal/cron_task/clear_msg.go
index 5ae3b16c6..08ef74cef 100644
--- a/internal/cron_task/clear_msg.go
+++ b/internal/cron_task/clear_msg.go
@@ -119,6 +119,9 @@ func deleteMongoMsg(operationID string, ID string, index int64, delStruct *delMs
 	} else {
 		var hasMarkDelFlag bool
 		for index, msg := range msgs.Msg {
+			if msg.SendTime == 0 {
+				continue
+			}
 			msgPb := &server_api_params.MsgData{}
 			err = proto.Unmarshal(msg.Msg, msgPb)
 			if err != nil {
diff --git a/internal/cron_task/clear_msg_test.go b/internal/cron_task/clear_msg_test.go
index 627ba1431..465216ce9 100644
--- a/internal/cron_task/clear_msg_test.go
+++ b/internal/cron_task/clear_msg_test.go
@@ -13,6 +13,7 @@ import (
 	"github.com/golang/protobuf/proto"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/options"
+	"gopkg.in/mgo.v2/bson"
 
 	"testing"
 	"time"
@@ -71,6 +72,11 @@ func CreateChat(userChat *db.UserChat) error {
 	return err
 }
 
+func DelChat(uid string, index int) error {
+	_, err := mongoClient.DeleteOne(context.Background(), bson.M{"uid": uid + ":" + strconv.Itoa(index)})
+	return err
+}
+
 func TestDeleteMongoMsgAndResetRedisSeq(t *testing.T) {
 	operationID := getCronTaskOperationID()
 	redisClient = redis.NewClient(&redis.Options{
@@ -84,10 +90,7 @@ func TestDeleteMongoMsgAndResetRedisSeq(t *testing.T) {
 	client, err := mongo.Connect(context.TODO(), options.Client().ApplyURI(mongoUri))
 	mongoClient = client.Database("openIM").Collection("msg")
 	testUID1 := "test_del_id1"
-
-	//testUID4 := "test_del_id4"
-	//testUID5 := "test_del_id5"
-	//testUID6 := "test_del_id6"
+	err = DelChat(testUID1, 0)
 	err = SetUserMaxSeq(testUID1, 600)
 	userChat := GenUserChat(1, 600, 200, 0, testUID1)
 	err = CreateChat(userChat)
@@ -106,11 +109,14 @@ func TestDeleteMongoMsgAndResetRedisSeq(t *testing.T) {
 	}
 
 	testUID2 := "test_del_id2"
+	err = DelChat(testUID2, 0)
+	err = DelChat(testUID2, 1)
 	err = SetUserMaxSeq(testUID2, 7000)
 	userChat = GenUserChat(1, 4999, 5000, 0, testUID2)
 	userChat2 := GenUserChat(5000, 7000, 6000, 1, testUID2)
 	err = CreateChat(userChat)
 	err = CreateChat(userChat2)
+
 	if err := DeleteMongoMsgAndResetRedisSeq(operationID, testUID2); err != nil {
 		t.Error("checkMaxSeqWithMongo failed", testUID2)
 	}
@@ -126,6 +132,7 @@ func TestDeleteMongoMsgAndResetRedisSeq(t *testing.T) {
 	}
 
 	testUID3 := "test_del_id3"
+	err = DelChat(testUID3, 0)
 	err = SetUserMaxSeq(testUID3, 4999)
 	userChat = GenUserChat(1, 4999, 5000, 0, testUID3)
 	err = CreateChat(userChat)
@@ -144,6 +151,9 @@ func TestDeleteMongoMsgAndResetRedisSeq(t *testing.T) {
 	}
 
 	testUID4 := "test_del_id4"
+	err = DelChat(testUID4, 0)
+	err = DelChat(testUID4, 1)
+	err = DelChat(testUID4, 2)
 	err = SetUserMaxSeq(testUID4, 12000)
 	userChat = GenUserChat(1, 4999, 5000, 0, testUID4)
 	userChat2 = GenUserChat(5000, 9999, 10000, 1, testUID4)
@@ -162,6 +172,55 @@ func TestDeleteMongoMsgAndResetRedisSeq(t *testing.T) {
 		t.Error("err is not nil", testUID4, err.Error())
 	}
 	if minSeq != 11001 {
-		t.Error("test3 is not the same", "minSeq:", minSeq, "targetSeq", 11001)
+		t.Error("test4 is not the same", "minSeq:", minSeq, "targetSeq", 11001)
+	}
+
+	testUID5 := "test_del_id5"
+	err = DelChat(testUID5, 0)
+	err = DelChat(testUID5, 1)
+	err = SetUserMaxSeq(testUID5, 9999)
+	userChat = GenUserChat(1, 4999, 5000, 0, testUID5)
+	userChat2 = GenUserChat(5000, 9999, 10000, 1, testUID5)
+	err = CreateChat(userChat)
+	err = CreateChat(userChat2)
+	if err := DeleteMongoMsgAndResetRedisSeq(operationID, testUID5); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID4)
+	}
+	if err := checkMaxSeqWithMongo(operationID, testUID5, constant.WriteDiffusion); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID5)
+	}
+	minSeq, err = GetUserMinSeq(testUID5)
+	if err != nil {
+		t.Error("err is not nil", testUID5, err.Error())
+	}
+	if minSeq != 10000 {
+		t.Error("test5 is not the same", "minSeq:", minSeq, "targetSeq", 10000)
+	}
+
+	testUID6 := "test_del_id6"
+	err = DelChat(testUID5, 0)
+	err = DelChat(testUID5, 1)
+	err = DelChat(testUID5, 2)
+	err = DelChat(testUID5, 3)
+	userChat = GenUserChat(1, 4999, 5000, 0, testUID6)
+	userChat2 = GenUserChat(5000, 9999, 10000, 1, testUID6)
+	userChat3 = GenUserChat(10000, 14999, 13000, 2, testUID6)
+	userChat4 := GenUserChat(15000, 19999, 0, 3, testUID6)
+	err = CreateChat(userChat)
+	err = CreateChat(userChat2)
+	err = CreateChat(userChat3)
+	err = CreateChat(userChat4)
+	if err := DeleteMongoMsgAndResetRedisSeq(operationID, testUID6); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID6)
+	}
+	if err := checkMaxSeqWithMongo(operationID, testUID6, constant.WriteDiffusion); err != nil {
+		t.Error("checkMaxSeqWithMongo failed", testUID6)
+	}
+	minSeq, err = GetUserMinSeq(testUID6)
+	if err != nil {
+		t.Error("err is not nil", testUID6, err.Error())
+	}
+	if minSeq != 13001 {
+		t.Error("test3 is not the same", "minSeq:", minSeq, "targetSeq", 13001)
 	}
 }
diff --git a/script/check_all.sh b/script/check_all.sh
index 76535c79f..af3d44ceb 100644
--- a/script/check_all.sh
+++ b/script/check_all.sh
@@ -54,13 +54,13 @@ else
 fi
 
 
-#check=$(ps aux | grep -w ./${cron_task_name} | grep -v grep | wc -l)
-#if [ $check -ge 1 ]; then
-#  echo -e ${GREEN_PREFIX}"none  port has been listening,belongs service is openImCronTask"${COLOR_SUFFIX}
-#else
-#  echo -e ${RED_PREFIX}"cron_task_name service does not start normally"${COLOR_SUFFIX}
-#        echo -e ${RED_PREFIX}"please check ../logs/openIM.log "${COLOR_SUFFIX}
-#      exit -1
-#fi
-#
-#echo -e ${YELLOW_PREFIX}"all services launch success"${COLOR_SUFFIX}
+check=$(ps aux | grep -w ./${cron_task_name} | grep -v grep | wc -l)
+if [ $check -ge 1 ]; then
+ echo -e ${GREEN_PREFIX}"none  port has been listening,belongs service is openImCronTask"${COLOR_SUFFIX}
+else
+ echo -e ${RED_PREFIX}"cron_task_name service does not start normally"${COLOR_SUFFIX}
+       echo -e ${RED_PREFIX}"please check ../logs/openIM.log "${COLOR_SUFFIX}
+     exit -1
+fi
+
+echo -e ${YELLOW_PREFIX}"all services launch success"${COLOR_SUFFIX}
diff --git a/script/start_all.sh b/script/start_all.sh
index 223187973..4a5f7d65e 100644
--- a/script/start_all.sh
+++ b/script/start_all.sh
@@ -10,7 +10,7 @@ need_to_start_server_shell=(
   sdk_svr_start.sh
   msg_gateway_start.sh
   demo_svr_start.sh
-#  start_cron.sh
+  start_cron.sh
 )
 time=`date +"%Y-%m-%d %H:%M:%S"`
 echo "==========================================================">>../logs/openIM.log 2>&1 &