diff --git a/cmd/server/config.go b/cmd/server/config.go
index 5ba1971..c739b9e 100644
--- a/cmd/server/config.go
+++ b/cmd/server/config.go
@@ -18,6 +18,7 @@ type Config struct {
 	PersistenceType string       `yaml:"persistence_type"`
 	PersistenceDir  string       `yaml:"persistence_dir"`
 	SyncEvery       int          `yaml:"sync_every"`
+	MemLen          int          `yaml:"mem_len"`
 	QuicConfig      *quic.Config `yaml:"quic_config"`
 
 	// BoltDB特有配置
diff --git a/cmd/server/main.go b/cmd/server/main.go
index 2230f16..3fbe77e 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -25,6 +25,7 @@ var (
 	persistenceType = flag.String("persistence", "none", "持久化类型 (none, wal)")
 	persistenceDir  = flag.String("persistence-dir", "./data", "持久化目录")
 	syncEvery       = flag.Int("sync-every", 100, "每写入多少条数据同步一次")
+	memLen          = flag.Int("mem-len", 2048, "内存缓冲区长度")
 	configPath      = flag.String("config", "config.yaml", "配置文件路径")
 	// 定义配置QUIC服务的命令行参数
 	quicAddr = flag.String("quic-addr", ":8083", "QUIC服务地址")
@@ -33,16 +34,6 @@ var (
 )
 
 func main() {
-	if *genSampleConfig {
-		err := GenerateSampleConfig("./config.yaml.sample")
-		if err != nil {
-			log.Fatalf("生成示例配置文件失败: %v", err)
-		}
-		log.Println("示例配置文件已生成")
-		return
-	}
-	flag.Parse()
-
 	// 保存命令行原始值，用于后续判断是否被用户显式设置
 	originalRestAddr := *restAddr
 	originalWsAddr := *wsAddr
@@ -52,6 +43,17 @@ func main() {
 	originalPersistenceType := *persistenceType
 	originalPersistenceDir := *persistenceDir
 	originalSyncEvery := *syncEvery
+	originalMemBufferLen := *memLen
+
+	if *genSampleConfig {
+		err := GenerateSampleConfig("./config.yaml.sample")
+		if err != nil {
+			log.Fatalf("生成示例配置文件失败: %v", err)
+		}
+		log.Println("示例配置文件已生成")
+		return
+	}
+	flag.Parse()
 
 	var config *Config
 	if *configPath != "" {
@@ -86,6 +88,9 @@ func main() {
 		if *syncEvery == originalSyncEvery {
 			syncEvery = &config.SyncEvery
 		}
+		if *memLen == originalMemBufferLen {
+			memLen = &config.MemLen
+		}
 	}
 
 	// 创建存储引擎配置
diff --git a/pkg/api/rest_test.go b/pkg/api/rest_test.go
index f0243c3..970ffe5 100644
--- a/pkg/api/rest_test.go
+++ b/pkg/api/rest_test.go
@@ -18,7 +18,7 @@ import (
 
 func setupTestRESTServer() *RESTServer {
 	// 创建存储引擎
-	engine := storage.NewMemoryEngine()
+	engine := storage.NewMemoryEngine(200)
 
 	// 创建数据管理器
 	dataManager := manager.NewDataManager(engine)
@@ -152,7 +152,7 @@ func TestRESTServer_QueryEndpoint(t *testing.T) {
 	server := setupTestRESTServer()
 
 	// 写入测试数据
-	engine := storage.NewMemoryEngine()
+	engine := storage.NewMemoryEngine(200)
 	dataManager := manager.NewDataManager(engine)
 	server.dataManager = dataManager
 
diff --git a/pkg/api/websocket_test.go b/pkg/api/websocket_test.go
index 1e1523a..4564e39 100644
--- a/pkg/api/websocket_test.go
+++ b/pkg/api/websocket_test.go
@@ -18,7 +18,7 @@ import (
 
 func setupTestWebSocketServer() *WebSocketServer {
 	// 创建存储引擎
-	engine := storage.NewMemoryEngine()
+	engine := storage.NewMemoryEngine(200)
 
 	// 创建数据管理器
 	dataManager := manager.NewDataManager(engine)
diff --git a/pkg/manager/datamanager_test.go b/pkg/manager/datamanager_test.go
index cdde7cf..c5499f8 100644
--- a/pkg/manager/datamanager_test.go
+++ b/pkg/manager/datamanager_test.go
@@ -11,7 +11,7 @@ import (
 
 func TestDataManager(t *testing.T) {
 	// 创建存储引擎
-	engine := storage.NewMemoryEngine()
+	engine := storage.NewMemoryEngine(200)
 
 	// 创建数据管理器
 	manager := NewDataManager(engine)
diff --git a/pkg/model/datapoint.go b/pkg/model/datapoint.go
index 567f9d4..b534577 100644
--- a/pkg/model/datapoint.go
+++ b/pkg/model/datapoint.go
@@ -75,15 +75,16 @@ type DataValue struct {
 
 // CircularBuffer 环形缓冲区
 type CircularBuffer struct {
-	Values [30]DataValue // 固定大小为30的环形缓冲区
-	Head   int           // 当前写入位置
-	Lock   sync.RWMutex  // 细粒度锁
+	Values []DataValue  // 固定大小为30的环形缓冲区
+	Head   int          // 当前写入位置
+	Lock   sync.RWMutex // 细粒度锁
 }
 
 // NewCircularBuffer 创建一个新的环形缓冲区
-func NewCircularBuffer() *CircularBuffer {
+func NewCircularBuffer(bufferLen int) *CircularBuffer {
 	return &CircularBuffer{
-		Head: -1, // 初始化为-1，表示缓冲区为空
+		Values: make([]DataValue, bufferLen),
+		Head:   -1, // 初始化为-1，表示缓冲区为空
 	}
 }
 
diff --git a/pkg/storage/boltdb.go b/pkg/storage/boltdb.go
index ebe3cea..dfeaf4f 100644
--- a/pkg/storage/boltdb.go
+++ b/pkg/storage/boltdb.go
@@ -178,7 +178,7 @@ func (e *BoltDBEngine) Read(ctx context.Context, id model.DataPointID) ([]model.
 	}
 
 	// 创建并填充缓存
-	buffer := model.NewCircularBuffer()
+	buffer := model.NewCircularBuffer(1024)
 	for _, value := range values {
 		buffer.Write(value)
 	}
diff --git a/pkg/storage/engine.go b/pkg/storage/engine.go
index bcce652..c2e6587 100644
--- a/pkg/storage/engine.go
+++ b/pkg/storage/engine.go
@@ -46,6 +46,7 @@ type StorageEngine interface {
 
 // MemoryEngine 内存存储引擎
 type MemoryEngine struct {
+	buffLen   int                              // every metric buffer size
 	data      map[string]*model.CircularBuffer // 数据存储
 	dataLock  sync.RWMutex                     // 数据锁
 	persister Persister                        // 持久化器
@@ -102,9 +103,10 @@ func (e *MemoryEngine) ReadDuration(ctx context.Context, id model.DataPointID, f
 }
 
 // NewMemoryEngine 创建一个新的内存存储引擎
-func NewMemoryEngine() *MemoryEngine {
+func NewMemoryEngine(memBufferLen int) *MemoryEngine {
 	return &MemoryEngine{
-		data: make(map[string]*model.CircularBuffer),
+		buffLen: memBufferLen,
+		data:    make(map[string]*model.CircularBuffer),
 	}
 }
 
@@ -118,7 +120,11 @@ func (e *MemoryEngine) Write(ctx context.Context, id model.DataPointID, value mo
 
 	if !exists {
 		// 如果数据点不存在，创建一个新的环形缓冲区
-		buffer = model.NewCircularBuffer()
+		bufferLen := e.buffLen
+		if bufferLen <= 0 {
+			bufferLen = 30
+		}
+		buffer = model.NewCircularBuffer(bufferLen)
 		e.dataLock.Lock()
 		e.data[key] = buffer
 		e.dataLock.Unlock()
diff --git a/pkg/storage/engine_test.go b/pkg/storage/engine_test.go
index 9e87eda..63d5c67 100644
--- a/pkg/storage/engine_test.go
+++ b/pkg/storage/engine_test.go
@@ -12,7 +12,7 @@ import (
 
 func TestMemoryEngine(t *testing.T) {
 	// 创建内存存储引擎
-	engine := NewMemoryEngine()
+	engine := NewMemoryEngine(200)
 
 	// 创建测试数据
 	id := model.DataPointID{
@@ -170,7 +170,7 @@ func TestPersistence(t *testing.T) {
 	defer os.RemoveAll(tempDir)
 
 	// 创建内存存储引擎
-	engine := NewMemoryEngine()
+	engine := NewMemoryEngine(200)
 
 	// 启用WAL持久化
 	persistenceConfig := PersistenceConfig{
@@ -221,7 +221,7 @@ func TestPersistence(t *testing.T) {
 	}
 
 	// 创建新的引擎并从WAL恢复
-	newEngine := NewMemoryEngine()
+	newEngine := NewMemoryEngine(200)
 	err = newEngine.EnablePersistence(persistenceConfig)
 	if err != nil {
 		t.Fatalf("EnablePersistence() for new engine error = %v", err)
diff --git a/pkg/storage/factory.go b/pkg/storage/factory.go
index 114c5a4..8830e7a 100644
--- a/pkg/storage/factory.go
+++ b/pkg/storage/factory.go
@@ -11,7 +11,8 @@ type EngineConfig struct {
 	PersistenceType PersistenceType // 持久化类型
 	PersistenceDir  string          // 持久化目录
 	SyncEvery       int             // 每写入多少条数据同步一次
-
+	// memory engine特有配置
+	MemLen int
 	// BoltDB特有配置
 	BoltDBFilename string        // BoltDB文件名
 	BoltDBOptions  *BoltDBConfig // BoltDB选项
@@ -25,7 +26,7 @@ func NewStorageEngine(config EngineConfig) (StorageEngine, error) {
 	switch config.PersistenceType {
 	case PersistenceTypeNone, PersistenceTypeWAL:
 		// 创建内存存储引擎
-		memEngine := NewMemoryEngine()
+		memEngine := NewMemoryEngine(config.MemLen)
 
 		// 如果需要持久化，启用WAL
 		if config.PersistenceType == PersistenceTypeWAL {