diff --git a/adapter/config/nacos/config.go b/adapter/config/nacos/config.go
index 2d4f5ce..69528e9 100644
--- a/adapter/config/nacos/config.go
+++ b/adapter/config/nacos/config.go
@@ -16,6 +16,7 @@ type Option func(*options)
 type options struct {
 	group  string
 	dataID string
+	format string
 }
 
 // WithGroup With nacos config group.
@@ -32,6 +33,13 @@ func WithDataID(dataID string) Option {
 	}
 }
 
+// WithFormat with nacos config format.
+func WithFormat(format string) Option {
+	return func(o *options) {
+		o.format = format
+	}
+}
+
 type Config struct {
 	opts   options
 	client config_client.IConfigClient
@@ -54,17 +62,21 @@ func (c *Config) Load() ([]*config.KeyValue, error) {
 		return nil, err
 	}
 	k := c.opts.dataID
+	format := strings.TrimPrefix(filepath.Ext(k), ".")
+	if format == "" && c.opts.format != "" {
+		format = c.opts.format
+	}
 	return []*config.KeyValue{
 		{
 			Key:    k,
 			Value:  []byte(content),
-			Format: strings.TrimPrefix(filepath.Ext(k), "."),
+			Format: format,
 		},
 	}, nil
 }
 
 func (c *Config) Watch() (config.Watcher, error) {
-	watcher := newWatcher(context.Background(), c.opts.dataID, c.opts.group, c.client.CancelListenConfig)
+	watcher := newWatcher(context.Background(), c.opts.dataID, c.opts.group, c.opts.format, c.client.CancelListenConfig)
 	err := c.client.ListenConfig(vo.ConfigParam{
 		DataId: c.opts.dataID,
 		Group:  c.opts.group,
diff --git a/adapter/config/nacos/watcher.go b/adapter/config/nacos/watcher.go
index 100cc8c..0636c1c 100644
--- a/adapter/config/nacos/watcher.go
+++ b/adapter/config/nacos/watcher.go
@@ -13,6 +13,7 @@ import (
 type Watcher struct {
 	dataID             string
 	group              string
+	format             string
 	content            chan string
 	cancelListenConfig cancelListenConfigFunc
 
@@ -22,11 +23,12 @@ type Watcher struct {
 
 type cancelListenConfigFunc func(params vo.ConfigParam) (err error)
 
-func newWatcher(ctx context.Context, dataID string, group string, cancelListenConfig cancelListenConfigFunc) *Watcher {
+func newWatcher(ctx context.Context, dataID string, group string, format string, cancelListenConfig cancelListenConfigFunc) *Watcher {
 	ctx, cancel := context.WithCancel(ctx)
 	w := &Watcher{
 		dataID:             dataID,
 		group:              group,
+		format:             format,
 		cancelListenConfig: cancelListenConfig,
 		content:            make(chan string, 100),
 
@@ -37,6 +39,10 @@ func newWatcher(ctx context.Context, dataID string, group string, cancelListenCo
 }
 
 func (w *Watcher) Next() ([]*config.KeyValue, error) {
+	format := strings.TrimPrefix(filepath.Ext(w.dataID), ".")
+	if format == "" && w.format != "" {
+		format = w.format
+	}
 	select {
 	case <-w.ctx.Done():
 		return nil, w.ctx.Err()
@@ -46,7 +52,7 @@ func (w *Watcher) Next() ([]*config.KeyValue, error) {
 			{
 				Key:    k,
 				Value:  []byte(content),
-				Format: strings.TrimPrefix(filepath.Ext(k), "."),
+				Format: format,
 			},
 		}, nil
 	}
diff --git a/api/config/v1/config.pb.go b/api/config/v1/config.pb.go
index d31c997..ec63afb 100644
--- a/api/config/v1/config.pb.go
+++ b/api/config/v1/config.pb.go
@@ -900,7 +900,7 @@ type Nacos struct {
 	// nacos config group
 	Group string `protobuf:"bytes,3,opt,name=group,proto3" json:"group,omitempty"`
 	// nacos config namespace
-	Namespaces string `protobuf:"bytes,4,opt,name=namespaces,proto3" json:"namespaces,omitempty"`
+	Namespace string `protobuf:"bytes,4,opt,name=namespace,proto3" json:"namespace,omitempty"`
 	// nacos config username
 	Username string `protobuf:"bytes,5,opt,name=username,proto3" json:"username,omitempty"`
 	// nacos config password
@@ -915,6 +915,8 @@ type Nacos struct {
 	Timeout *durationpb.Duration `protobuf:"bytes,10,opt,name=timeout,proto3" json:"timeout,omitempty"`
 	// nacos logger level. default info
 	LogLevel string `protobuf:"bytes,11,opt,name=log_level,json=logLevel,proto3" json:"log_level,omitempty"`
+	// nacos format, default=yaml
+	Format string `protobuf:"bytes,12,opt,name=format,proto3" json:"format,omitempty"`
 }
 
 func (x *Nacos) Reset() {
@@ -970,9 +972,9 @@ func (x *Nacos) GetGroup() string {
 	return ""
 }
 
-func (x *Nacos) GetNamespaces() string {
+func (x *Nacos) GetNamespace() string {
 	if x != nil {
-		return x.Namespaces
+		return x.Namespace
 	}
 	return ""
 }
@@ -1026,6 +1028,13 @@ func (x *Nacos) GetLogLevel() string {
 	return ""
 }
 
+func (x *Nacos) GetFormat() string {
+	if x != nil {
+		return x.Format
+	}
+	return ""
+}
+
 // middleware config
 type Middleware struct {
 	state         protoimpl.MessageState
@@ -1225,36 +1234,37 @@ var file_config_v1_config_proto_rawDesc = []byte{
 	0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09,
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 }
 
 var (
diff --git a/api/config/v1/config.proto b/api/config/v1/config.proto
index c20c727..38bf983 100644
--- a/api/config/v1/config.proto
+++ b/api/config/v1/config.proto
@@ -120,7 +120,7 @@ message Nacos {
   // nacos config group
   string group = 3;
   // nacos config namespace
-  string namespaces = 4;
+  string namespace = 4;
   // nacos config username
   string username = 5;
   // nacos config password
@@ -135,6 +135,8 @@ message Nacos {
   google.protobuf.Duration timeout = 10;
   // nacos logger level. default info
   string log_level = 11;
+  // nacos format, default=yaml
+  string format = 12;
 }
 
 // middleware config
diff --git a/config/config.go b/config/config.go
index d7747f7..1d630b6 100644
--- a/config/config.go
+++ b/config/config.go
@@ -109,13 +109,16 @@ func (c *Config) buildNacosSource() ([]kConfig.Source, error) {
 	} else if cfg.GetLogLevel() == "" {
 		cfg.LogLevel = "info"
 	}
+	if cfg.Format == "" {
+		cfg.Format = "yaml"
+	}
 
 	clientConfig := constant.NewClientConfig(
 		constant.WithUsername(cfg.GetUsername()),
 		constant.WithPassword(cfg.GetPassword()),
 		constant.WithTimeoutMs(duration),
 		constant.WithCacheDir(cfg.GetCacheDir()),
-		constant.WithNamespaceId(cfg.GetNamespaces()),
+		constant.WithNamespaceId(cfg.GetNamespace()),
 		constant.WithNotLoadCacheAtStart(true),
 		constant.WithLogLevel(cfg.LogLevel),
 		constant.WithOpenKMS(false),
@@ -131,7 +134,7 @@ func (c *Config) buildNacosSource() ([]kConfig.Source, error) {
 	}
 
 	return []kConfig.Source{
-		nacos.NewConfigSource(client, nacos.WithDataID(cfg.DataId), nacos.WithGroup(cfg.Group)),
+		nacos.NewConfigSource(client, nacos.WithDataID(cfg.DataId), nacos.WithGroup(cfg.Group), nacos.WithFormat(cfg.Format)),
 	}, nil
 }