diff --git a/cache/waf_cache.go b/cache/waf_cache.go
new file mode 100644
index 0000000..636221e
--- /dev/null
+++ b/cache/waf_cache.go
@@ -0,0 +1,98 @@
+package cache
+
+import (
+	"errors"
+	"sync"
+	"time"
+)
+
+type WafCache struct {
+	cache map[string]WafCacheItem
+	mu    sync.Mutex
+}
+type WafCacheItem struct {
+	value      interface{}
+	createTime time.Time
+	lastTime   time.Time
+	ttl        time.Duration
+}
+
+func InitWafCache() *WafCache {
+	wafcache := &WafCache{
+		cache: make(map[string]WafCacheItem),
+		mu:    sync.Mutex{},
+	}
+	go wafcache.ClearExpirationCacheRoutine()
+	return wafcache
+}
+func (wafCache *WafCache) Set(key string, value interface{}) {
+	wafCache.SetWithTTl(key, value, -1)
+}
+
+func (wafCache *WafCache) SetWithTTl(key string, value interface{}, ttl time.Duration) {
+	wafCache.mu.Lock()
+	defer wafCache.mu.Unlock()
+	createTime := time.Now()
+	item, found := wafCache.cache[key]
+
+	if found {
+		createTime = item.createTime
+	}
+	wafCache.cache[key] = WafCacheItem{
+		value:      value,
+		createTime: createTime,
+		lastTime:   time.Now(),
+		ttl:        ttl,
+	}
+}
+func (wafCache *WafCache) GetString(key string) (string, error) {
+	key1Value := wafCache.Get(key)
+	if str, ok := key1Value.(string); ok {
+		return str, nil
+	}
+	return "", errors.New("数据不存在")
+}
+func (wafCache *WafCache) Get(key string) interface{} {
+	wafCache.mu.Lock()
+	defer wafCache.mu.Unlock()
+	item, found := wafCache.cache[key]
+	if !found {
+		return nil
+	}
+	if time.Since(item.createTime) <= item.ttl {
+		return item.value
+	}
+	delete(wafCache.cache, key)
+	return nil
+}
+func (wafCache *WafCache) GetLastTime(key string) (time.Time, error) {
+	wafCache.mu.Lock()
+	defer wafCache.mu.Unlock()
+	item, found := wafCache.cache[key]
+	if !found {
+		return time.Time{}, errors.New("数据不存在")
+	}
+	if time.Since(item.createTime) <= item.ttl {
+		return item.lastTime, nil
+	}
+	delete(wafCache.cache, key)
+	return time.Time{}, errors.New("数据已过期")
+}
+func (wafCache *WafCache) ClearExpirationCache() {
+	println("准备检测过期键")
+	now := time.Now()
+	for key, item := range wafCache.cache {
+		if now.Sub(item.createTime) > item.ttl {
+			println("删除" + key)
+			delete(wafCache.cache, key)
+		}
+	}
+}
+func (wafCache *WafCache) ClearExpirationCacheRoutine() {
+	println("启动协程检测过期的")
+	ticker := time.NewTicker(60 * time.Second)
+	defer ticker.Stop()
+	for range ticker.C {
+		wafCache.ClearExpirationCache()
+	}
+}
diff --git a/cache/waf_cache_test.go b/cache/waf_cache_test.go
new file mode 100644
index 0000000..b9f4ec7
--- /dev/null
+++ b/cache/waf_cache_test.go
@@ -0,0 +1,35 @@
+package cache
+
+import (
+	"testing"
+	"time"
+)
+
+func TestWafCache_SetWithTTl(t *testing.T) {
+	wafcache := InitWafCache()
+	wafcache.SetWithTTl("KEY1", "我是key1的值", 5*time.Second)
+	time.Sleep(65 * time.Second)
+	key1Value := wafcache.Get("KEY1")
+	if str, ok := key1Value.(string); ok {
+		println(str)
+	}
+	time.Sleep(65 * time.Second)
+
+}
+func TestWafCache_GetLastTime(t *testing.T) {
+	wafcache := InitWafCache()
+	wafcache.SetWithTTl("KEY1", "我是key1的值", 5*time.Second)
+	key1Value, err := wafcache.GetLastTime("KEY1")
+	if err == nil {
+		println(key1Value.String())
+	}
+}
+
+func TestWafCache_GetString(t *testing.T) {
+	wafcache := InitWafCache()
+	wafcache.SetWithTTl("KEY1", "我是key1的值字符串", 5*time.Second)
+	key1Value, err := wafcache.GetString("KEY1")
+	if err == nil {
+		println(key1Value)
+	}
+}