diff --git a/pkg/flow/quota/assist.go b/pkg/flow/quota/assist.go
index 042f80a8..cd1211c7 100644
--- a/pkg/flow/quota/assist.go
+++ b/pkg/flow/quota/assist.go
@@ -256,6 +256,7 @@ func (f *FlowQuotaAssistant) GetQuota(commonRequest *data.CommonRateLimitRequest
 		return model.QuotaFutureWithResponse(resp), nil
 	}
 	var maxWaitMs int64 = 0
+	// releaseFuncs release 方法列表。如果有多个 window，用这个列表收集所有 window 的 release 方法
 	var releaseFuncs = make([]model.ReleaseFunc, 0, len(windows))
 	for _, window := range windows {
 		window.Init()
@@ -263,6 +264,7 @@ func (f *FlowQuotaAssistant) GetQuota(commonRequest *data.CommonRateLimitRequest
 		if quotaResult == nil {
 			continue
 		}
+		// 收集所有 window 的 release 方法
 		for _, releaseFunc := range quotaResult.ReleaseFuncs {
 			if releaseFunc != nil {
 				releaseFuncs = append(releaseFuncs, releaseFunc)
diff --git a/plugin/ratelimiter/bbr/cpu/stat.go b/plugin/ratelimiter/bbr/cpu/stat.go
index 92d8a5c7..7399db0f 100644
--- a/plugin/ratelimiter/bbr/cpu/stat.go
+++ b/plugin/ratelimiter/bbr/cpu/stat.go
@@ -21,16 +21,15 @@ type CPU interface {
 	Info() Info
 }
 
-func init() {
+func Init() error {
 	var (
 		err error
 	)
 	stats, err = newCgroupCPU()
 	if err != nil {
-		// fmt.Printf("cgroup cpu init failed(%v),switch to psutil cpu\n", err)
 		stats, err = newPsutilCPU(interval)
 		if err != nil {
-			panic(fmt.Sprintf("cgroup cpu init failed!err:=%v", err))
+			return fmt.Errorf("cgroup cpu init failed! err: %s", err.Error())
 		}
 	}
 	go func() {
@@ -44,6 +43,7 @@ func init() {
 			}
 		}
 	}()
+	return nil
 }
 
 // Stat cpu stat.
diff --git a/plugin/ratelimiter/bbr/plugin.go b/plugin/ratelimiter/bbr/plugin.go
index 9ea58895..7e61ec03 100644
--- a/plugin/ratelimiter/bbr/plugin.go
+++ b/plugin/ratelimiter/bbr/plugin.go
@@ -7,6 +7,7 @@ import (
 	"github.com/polarismesh/polaris-go/pkg/plugin/common"
 	"github.com/polarismesh/polaris-go/pkg/plugin/ratelimiter"
 	"github.com/polarismesh/polaris-go/plugin/ratelimiter/bbr/core"
+	"github.com/polarismesh/polaris-go/plugin/ratelimiter/bbr/cpu"
 )
 
 // BBRPlugin 基于 CPU BBR 策略的限流控制器
@@ -27,6 +28,9 @@ func (g *BBRPlugin) Name() string {
 // Init 初始化插件
 func (g *BBRPlugin) Init(ctx *plugin.InitContext) error {
 	g.PluginBase = plugin.NewPluginBase(ctx)
+	if err := cpu.Init(); err != nil {
+		return err
+	}
 	go core.CollectCPUStat()
 	return nil
 }