diff --git a/.gitignore b/.gitignore
index b6d444b..7091e8e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,4 +25,4 @@ go.work
 .idea/*
 
 main
-*/leveldb
+leveldb
diff --git a/internal/client/client_node.go b/internal/client/client_node.go
index 345ed05..7eaf99d 100644
--- a/internal/client/client_node.go
+++ b/internal/client/client_node.go
@@ -24,8 +24,8 @@ const (
 	Fail
 )
 
-func (client *Client) Write(kv nodes.LogEntry) Status {
-	log.Info("client write request key :" + kv.Key)
+func (client *Client) Write(kvCall nodes.LogEntryCall) Status {
+	log.Info("client write request key :" + kvCall.LogE.Key)
 	c, err := rpc.DialHTTP("tcp", client.Address)
 	if err != nil {
 		log.Error("dialing: ", zap.Error(err))
@@ -40,7 +40,7 @@ func (client *Client) Write(kv nodes.LogEntry) Status {
 	}(c)
 
 	var reply nodes.ServerReply
-	callErr := c.Call("Node.WriteKV", kv, &reply) // RPC
+	callErr := c.Call("Node.WriteKV", kvCall, &reply) // RPC
 	if callErr != nil {
 		log.Error("dialing: ", zap.Error(callErr))
 		return Fail
diff --git a/internal/nodes/init.go b/internal/nodes/init.go
index 4ef68fe..0a38451 100644
--- a/internal/nodes/init.go
+++ b/internal/nodes/init.go
@@ -82,7 +82,8 @@ func Start(node *Node, isLeader bool) {
 
 								log.Info("send : logId = " + strconv.Itoa(logId) + ", key = " + input)
 								// 广播给其它节点
-								node.BroadCastKV(logId, kv)
+								kvCall := LogEntryCall{kv, Normal}
+								node.BroadCastKV(logId, kvCall)
 								// 持久化
 								node.db.Put([]byte(kv.Key), []byte(kv.Value), nil)
 							}
diff --git a/internal/nodes/log.go b/internal/nodes/log.go
index 95c67d0..3d13831 100644
--- a/internal/nodes/log.go
+++ b/internal/nodes/log.go
@@ -1,10 +1,21 @@
 package nodes
 
+const (
+	Normal State = iota + 1
+	Delay
+	Fail
+)
+
 type LogEntry struct {
 	Key string
 	Value string
 }
 
+type LogEntryCall struct {
+	LogE LogEntry
+	CallState State
+}
+
 type KVReply struct {
 	Reply bool
 }
diff --git a/internal/nodes/node.go b/internal/nodes/node.go
index 1c99767..f1a17c8 100644
--- a/internal/nodes/node.go
+++ b/internal/nodes/node.go
@@ -1,8 +1,10 @@
 package nodes
 
 import (
+	"math/rand"
 	"net/rpc"
 	"strconv"
+	"time"
 
 	"github.com/syndtr/goleveldb/leveldb"
 	"go.uber.org/zap"
@@ -38,22 +40,33 @@ type Node struct {
 	log map[int]LogEntry
 
 	// leader用来标记新log
-	maxLogId int 
+	maxLogId int
 
 	db *leveldb.DB
 }
 
-func (node *Node) BroadCastKV(logId int, kv LogEntry) {
+func (node *Node) BroadCastKV(logId int, kvCall LogEntryCall) {
 	// 遍历所有节点
 	for id, _ := range node.nodes {
-		go func(id string, kv LogEntry) {
+		go func(id string, kv LogEntryCall) {
 			var reply KVReply
-			node.sendKV(id, logId, kv, &reply)
-		}(id, kv)
+			node.sendKV(id, logId, kvCall, &reply)
+		}(id, kvCall)
 	}
 }
 
-func (node *Node) sendKV(id string, logId int, kv LogEntry, reply *KVReply) {
+func (node *Node) sendKV(id string, logId int, kvCall LogEntryCall, reply *KVReply) {
+	switch kvCall.CallState {
+	case Fail:
+		log.Info("模拟发送失败")
+		// 这么写向所有的node发送都失败，也可以随机数确定是否失败
+	case Delay:
+		log.Info("模拟发送延迟")
+		// 随机延迟0-5ms
+		time.Sleep(time.Millisecond * time.Duration(rand.Intn(5)))
+	default:
+	}
+
 	client, err := rpc.DialHTTP("tcp", node.nodes[id].address)
 	if err != nil {
 		log.Error("dialing: ", zap.Error(err))
@@ -67,16 +80,16 @@ func (node *Node) sendKV(id string, logId int, kv LogEntry, reply *KVReply) {
 		}
 	}(client)
 
-	arg := LogIdAndEntry{logId, kv}
+	arg := LogIdAndEntry{logId, kvCall.LogE}
 	callErr := client.Call("Node.ReceiveKV", arg, reply) // RPC
 	if callErr != nil {
-		log.Error("dialing node_" + id + "fail: ", zap.Error(callErr))
+		log.Error("dialing node_"+id+"fail: ", zap.Error(callErr))
 	}
 }
 
 // RPC call
 func (node *Node) ReceiveKV(arg LogIdAndEntry, reply *KVReply) error {
-	log.Info("node_" + node.selfId + " receive: logId = "+ strconv.Itoa(arg.LogId) + ", key = " + arg.Entry.Key)
+	log.Info("node_" + node.selfId + " receive: logId = " + strconv.Itoa(arg.LogId) + ", key = " + arg.Entry.Key)
 	entry, ok := node.log[arg.LogId]
 	if !ok {
 		node.log[arg.LogId] = entry
@@ -86,4 +99,3 @@ func (node *Node) ReceiveKV(arg LogIdAndEntry, reply *KVReply) error {
 	reply.Reply = true // rpc call需要有reply，但实际上调用是否成功是error返回值决定
 	return nil
 }
-
diff --git a/internal/nodes/server_node.go b/internal/nodes/server_node.go
index a7681a7..58eed40 100644
--- a/internal/nodes/server_node.go
+++ b/internal/nodes/server_node.go
@@ -13,15 +13,15 @@ type ServerReply struct{
 	Value string
 }
 // RPC call
-func (node *Node) WriteKV(kv LogEntry, reply *ServerReply) error {
+func (node *Node) WriteKV(kvCall LogEntryCall, reply *ServerReply) error {
 	
 	logId := node.maxLogId
 	node.maxLogId++
-	node.log[logId] = kv
-	// 广播给其它节点
-	node.db.Put([]byte(kv.Key), []byte(kv.Value), nil)
-	log.Info("server write : logId = " + strconv.Itoa(logId) + ", key = " + kv.Key)
-	node.BroadCastKV(logId, kv)
+	node.log[logId] = kvCall.LogE
+	node.db.Put([]byte(kvCall.LogE.Key), []byte(kvCall.LogE.Value), nil)
+	log.Info("server write : logId = " + strconv.Itoa(logId) + ", key = " + kvCall.LogE.Key)
+	// 广播给其它节点	
+	node.BroadCastKV(logId, kvCall)
 	reply.Isconnect = true
 	return nil
 }
diff --git a/test/restart_follower_test.go b/test/restart_follower_test.go
index 4bbce54..323507d 100644
--- a/test/restart_follower_test.go
+++ b/test/restart_follower_test.go
@@ -46,7 +46,8 @@ func TestFollowerRestart(t *testing.T) {
 	var s clientPkg.Status
 	for i := 0; i < 5; i++ {
 		key := strconv.Itoa(i)
-		s := cWrite.Write(nodes.LogEntry{Key: key, Value: "hello"})
+		newlog := nodes.LogEntry{Key: key, Value: "hello"}
+		s := cWrite.Write(nodes.LogEntryCall{LogE: newlog, CallState: nodes.Normal})
 		if s != clientPkg.Ok {
 			t.Errorf("write test fail")
 		}		
@@ -61,7 +62,8 @@ func TestFollowerRestart(t *testing.T) {
 	// 继续写入
 	for i := 5; i < 10; i++ {
 		key := strconv.Itoa(i)
-		s := cWrite.Write(nodes.LogEntry{Key: key, Value: "hello"})
+		newlog := nodes.LogEntry{Key: key, Value: "hello"}
+		s := cWrite.Write(nodes.LogEntryCall{LogE: newlog, CallState: nodes.Normal})
 		if s != clientPkg.Ok {
 			t.Errorf("write test fail")
 		}		
diff --git a/test/server_client_test.go b/test/server_client_test.go
index 74599a5..ab106c3 100644
--- a/test/server_client_test.go
+++ b/test/server_client_test.go
@@ -46,7 +46,8 @@ func TestServerClient(t *testing.T) {
 	var s clientPkg.Status
 	for i := 0; i < 10; i++ {
 		key := strconv.Itoa(i)
-		s := c.Write(nodes.LogEntry{Key: key, Value: "hello" + key})
+		newlog := nodes.LogEntry{Key: key, Value: "hello"}
+		s := c.Write(nodes.LogEntryCall{LogE: newlog, CallState: nodes.Normal})
 		if s != clientPkg.Ok {
 			t.Errorf("write test fail")
 		}