diff --git a/server/internal/middleware/frequencyControl.go b/server/internal/middleware/frequencyControl.go
deleted file mode 100644
index 4ec151f..0000000
--- a/server/internal/middleware/frequencyControl.go
+++ /dev/null
@@ -1,55 +0,0 @@
-package middleware
-
-import (
-	"sync"
-	"time"
-
-	"github.com/gin-gonic/gin"
-)
-
-// define rate limit struct
-type frequencyControlByTokenBucket struct {
-	refreshRate float64    // 令牌的刷新速率
-	capacity    int64      // 桶的容量
-	tokens      float64    // 当前令牌数量
-	lastToken   time.Time  // 上一次放令牌的时间
-	mtx         sync.Mutex // 互斥锁
-}
-
-// allow frequency
-func (tb *frequencyControlByTokenBucket) Allow() bool {
-	tb.mtx.Lock()
-	defer tb.mtx.Unlock()
-	now := time.Now()
-	// compute tokens which needs
-	tb.tokens = tb.tokens + tb.refreshRate*now.Sub(tb.lastToken).Seconds()
-	if tb.tokens > float64(tb.capacity) {
-		tb.tokens = float64(tb.capacity)
-	}
-	// judge weather to pass through
-	if tb.tokens >= 1 {
-		tb.tokens--
-		tb.lastToken = now
-		return true
-	} else {
-		return false
-	}
-}
-
-// registried a middle ware
-func LimitHandler(maxConn int, refreshRate float64) gin.HandlerFunc {
-	tb := &frequencyControlByTokenBucket{
-		capacity:    int64(maxConn),
-		refreshRate: refreshRate,
-		tokens:      0,
-		lastToken:   time.Now(),
-	}
-	return func(c *gin.Context) {
-		if !tb.Allow() {
-			c.String(503, "Too many request")
-			c.Abort()
-			return
-		}
-		c.Next()
-	}
-}