diff --git a/storage/dao/dao.go b/storage/dao/dao.go
new file mode 100644
index 0000000..6e8eb70
--- /dev/null
+++ b/storage/dao/dao.go
@@ -0,0 +1,132 @@
+package dao
+
+import (
+	"gitee.com/timedb/wheatCache/pkg/errorx"
+	"gitee.com/timedb/wheatCache/pkg/lru"
+	"gitee.com/timedb/wheatCache/pkg/structure"
+	"gitee.com/timedb/wheatCache/pkg/structure/stringx"
+)
+
+type Dao struct {
+	lru lru.CacheInterface
+}
+
+func NewDao(lru lru.CacheInterface) *Dao {
+	return &Dao{
+		lru: lru,
+	}
+}
+
+func (d *Dao) Set(key string, strVal string) (string, error) {
+	value, ok := d.lru.Get(key)
+	if ok {
+		if val, ok := value.(structure.StringXInterface); ok {
+			res, length := val.Set(strVal)
+			d.lru.UpdateLruSize(length)
+			return res, nil
+		} else {
+			return "", errorx.New("the key:%s is not stringx type", key)
+		}
+	}
+
+	// 不存在新建
+	strValue := stringx.NewStringSingle()
+	result, length := strValue.Set(strVal)
+	d.lru.Add(key, strValue)
+	d.lru.UpdateLruSize(length)
+	return result, nil
+}
+
+func (d *Dao) Get(key string) (string, error) {
+	val, ok := d.lru.Get(key)
+	if !ok {
+		return "", errorx.NotKeyErr(key)
+	}
+
+	strVal, ok := val.(structure.StringXInterface)
+	if !ok {
+		return "", errorx.DaoTypeErr("stringx")
+	}
+
+	return strVal.Get(), nil
+}
+
+func (d *Dao) Add(key string, renewal int32) (string, error) {
+	value, lruOk := d.lru.Get(key)
+	if !lruOk {
+		val := stringx.NewStringSingle()
+		res, err := val.Add(renewal)
+		if err != nil {
+			return "", nil
+		}
+		d.lru.Add(key, val)
+		return res, nil
+	}
+
+	strVal, ok := value.(structure.StringXInterface)
+	if !ok {
+		return "", errorx.DaoTypeErr("stringx")
+	}
+
+	res, err := strVal.Add(renewal)
+	if err != nil {
+		return "", err
+	}
+	return res, nil
+}
+
+func (d *Dao) Reduce(key string, renewal int32) (string, error) {
+	value, lruOk := d.lru.Get(key)
+	if !lruOk {
+		val := stringx.NewStringSingle()
+		res, err := val.Reduce(renewal)
+		if err != nil {
+			return "", nil
+		}
+		d.lru.Add(key, val)
+		return res, nil
+	}
+
+	strVal, ok := value.(structure.StringXInterface)
+	if !ok {
+		return "", errorx.DaoTypeErr("stringx")
+	}
+
+	res, err := strVal.Reduce(renewal)
+	if err != nil {
+		return "", err
+	}
+	return res, nil
+}
+
+func (d *Dao) Setbit(key string, val bool, offer int32) error {
+	value, lruOk := d.lru.Get(key)
+	if !lruOk {
+		valStr := stringx.NewStringSingle()
+		length := valStr.Setbit(offer, val)
+		d.lru.UpdateLruSize(length)
+		d.lru.Add(key, valStr)
+		return nil
+	}
+
+	strVal, ok := value.(structure.StringXInterface)
+	if !ok {
+		return errorx.DaoTypeErr("stringx")
+	}
+
+	length := strVal.Setbit(offer, val)
+	d.lru.UpdateLruSize(length)
+	return nil
+}
+
+func (d *Dao) GetBit(key string, offer int32) (bool, error) {
+	value, lruOk := d.lru.Get(key)
+	if !lruOk {
+		return false, errorx.NotKeyErr(key)
+	}
+	strVal, ok := value.(structure.StringXInterface)
+	if !ok {
+		return false, errorx.DaoTypeErr("stringx")
+	}
+	return strVal.Getbit(offer)
+}
diff --git a/storage/dao/define.go b/storage/dao/define.go
new file mode 100644
index 0000000..07a0cc0
--- /dev/null
+++ b/storage/dao/define.go
@@ -0,0 +1 @@
+package dao