diff --git a/pkg/serverconfigs/http_cache_policy.go b/pkg/serverconfigs/http_cache_policy.go
index 6454d82..7b87ac1 100644
--- a/pkg/serverconfigs/http_cache_policy.go
+++ b/pkg/serverconfigs/http_cache_policy.go
@@ -96,7 +96,7 @@ func (this *HTTPCachePolicy) UpdateDiskDir(dir string, subDirs []*CacheDir) {
 			return
 		}
 
-		var options = &HTTPFileCacheStorage{}
+		var options = NewHTTPFileCacheStorage()
 		err = json.Unmarshal(oldOptionsJSON, options)
 		if err != nil {
 			return
diff --git a/pkg/serverconfigs/http_cache_storage_file.go b/pkg/serverconfigs/http_cache_storage_file.go
index f5837a5..4e57f71 100644
--- a/pkg/serverconfigs/http_cache_storage_file.go
+++ b/pkg/serverconfigs/http_cache_storage_file.go
@@ -16,6 +16,14 @@ type HTTPFileCacheStorage struct {
 
 	OpenFileCache  *OpenFileCacheConfig `yaml:"openFileCache" json:"openFileCache"`   // open file cache配置
 	EnableSendfile bool                 `yaml:"enableSendFile" json:"enableSendfile"` // 是否启用Sendfile
+
+	EnableMMAP bool `yaml:"enableMMAP" json:"enableMMAP"` // 是否启用MMAP
+}
+
+func NewHTTPFileCacheStorage() *HTTPFileCacheStorage {
+	return &HTTPFileCacheStorage{
+		EnableMMAP: true,
+	}
 }
 
 func (this *HTTPFileCacheStorage) Init() error {