diff --git a/README.md b/README.md
index a72b8fa..08a9ba1 100644
--- a/README.md
+++ b/README.md
@@ -5,12 +5,15 @@ a simple front of WordPress build with golang.
 
 #### 特色功能
 
-- 缓存配置
+- 多种缓存配置
 - 添加评论或panic时发邮件通知，包涵栈调用和请求信息
 - 简单的流量限制中间件
 - 除配置文件外将所有静态资源都打包到执行文件中
 - 支持密码查看，且cookie信息可被php版所验证
 - 支持rss2订阅
+- 热更新配置、清空缓存
+  - kill -SIGUSR1 PID 更新配置和清空缓存
+  - kill -SIGUSR2 PID 清空缓存
 
 #### 其它
 用的gin框架和sqlx,在外面封装了层查询的方法。后台可以设置的比较少，大部分设置还没打通。
\ No newline at end of file
diff --git a/middleware/iplimit.go b/middleware/iplimit.go
index 940356f..feb58ae 100644
--- a/middleware/iplimit.go
+++ b/middleware/iplimit.go
@@ -10,15 +10,19 @@ import (
 type IpLimitMap struct {
 	mux      *sync.RWMutex
 	m        map[string]*int64
-	limitNum int64
+	limitNum *int64
 }
 
-func IpLimit(num int64) func(ctx *gin.Context) {
+func IpLimit(num int64) (func(ctx *gin.Context), func(int64)) {
 	m := IpLimitMap{
 		mux:      &sync.RWMutex{},
 		m:        make(map[string]*int64),
-		limitNum: num,
+		limitNum: new(int64),
 	}
+	fn := func(num int64) {
+		atomic.StoreInt64(m.limitNum, num)
+	}
+	fn(num)
 
 	return func(c *gin.Context) {
 		ip := c.ClientIP()
@@ -45,7 +49,7 @@ func IpLimit(num int64) func(ctx *gin.Context) {
 			m.mux.Unlock()
 		}
 
-		if m.limitNum > 0 && atomic.LoadInt64(i) >= m.limitNum {
+		if atomic.LoadInt64(m.limitNum) > 0 && atomic.LoadInt64(i) >= atomic.LoadInt64(m.limitNum) {
 			c.Status(http.StatusForbidden)
 			c.Abort()
 			return
@@ -53,5 +57,5 @@ func IpLimit(num int64) func(ctx *gin.Context) {
 		atomic.AddInt64(i, 1)
 		s = true
 		c.Next()
-	}
+	}, fn
 }
diff --git a/middleware/searchlimit.go b/middleware/searchlimit.go
index 52a52cd..eda4ab8 100644
--- a/middleware/searchlimit.go
+++ b/middleware/searchlimit.go
@@ -2,8 +2,8 @@ package middleware
 
 import "github.com/gin-gonic/gin"
 
-func SearchLimit(num int64) func(ctx *gin.Context) {
-	fn := IpLimit(num)
+func SearchLimit(num int64) (func(ctx *gin.Context), func(int64)) {
+	fn, reFn := IpLimit(num)
 	return func(c *gin.Context) {
 		if c.Query("s") != "" {
 			fn(c)
@@ -11,5 +11,5 @@ func SearchLimit(num int64) func(ctx *gin.Context) {
 			c.Next()
 		}
 
-	}
+	}, reFn
 }
diff --git a/route/route.go b/route/route.go
index 121b7d9..44cbbd2 100644
--- a/route/route.go
+++ b/route/route.go
@@ -64,7 +64,8 @@ func SetupRouter() (*gin.Engine, func()) {
 	}))
 	store := cookie.NewStore([]byte("secret"))
 	r.Use(sessions.Sessions("go-wp", store))
-	r.GET("/", middleware.SearchLimit(c.SingleIpSearchNum), actions.Index)
+	sl, slRload := middleware.SearchLimit(c.SingleIpSearchNum)
+	r.GET("/", sl, actions.Index)
 	r.GET("/page/:page", actions.Index)
 	r.GET("/p/category/:category", actions.Index)
 	r.GET("/p/category/:category/page/:page", actions.Index)
@@ -86,6 +87,7 @@ func SetupRouter() (*gin.Engine, func()) {
 		reloadValidServerNameFn()
 		c := config.Conf.Load()
 		flReload(c.MaxRequestSleepNum, c.MaxRequestNum, c.SleepTime)
+		slRload(c.SingleIpSearchNum)
 	}
 	return r, fn
 }