diff --git a/pkg/structure/value.go b/pkg/structure/value.go
index 3ab4fd4..3dfebb0 100644
--- a/pkg/structure/value.go
+++ b/pkg/structure/value.go
@@ -3,6 +3,7 @@ package structure
 import (
 	"bytes"
 	"encoding/binary"
+	"fmt"
 	"math"
 	"strconv"
 
@@ -175,12 +176,34 @@ func (v *Value) GetByte(offset int) (bool, error) {
 }
 
 func (v *Value) SliceByString(start, end int) ([]byte, error) {
-	if v.onType != DynamicString {
-		return nil, errorx.New("not is string")
-	}
 	if start > end {
 		return nil, errorx.New("the end cannot be greater than the beginning")
 	}
+
+	if v.onType == DynamicInt {
+		ret, err := v.ToInt()
+		if err != nil {
+			return nil, err
+		}
+		value := strconv.Itoa(int(ret))
+		if end > len(value) {
+			return nil, errorx.New("the maximum index is exceeded, max index: %d", len(value))
+		}
+		return []byte(value[start:end]), nil
+	}
+
+	if v.onType == DynamicFloat {
+		ret, err := v.ToFloat64()
+		if err != nil {
+			return nil, err
+		}
+		value := fmt.Sprintf("%.2f", ret)
+		if end > len(value) {
+			return nil, errorx.New("the maximum index is exceeded, max index: %d", len(value))
+		}
+		return []byte(value[start:end]), nil
+	}
+
 	if end > v.length {
 		return nil, errorx.New("the maximum index is exceeded, max index: %d", v.length)
 	}
diff --git a/storage/dao/stringx.go b/storage/dao/stringx.go
index 21cadf9..87de94a 100644
--- a/storage/dao/stringx.go
+++ b/storage/dao/stringx.go
@@ -147,19 +147,28 @@ func (d *Dao) GetRange(key *proto.BaseKey, start, end int32) (*proto.GetRangeRes
 
 func (d *Dao) GetSet(key *proto.BaseKey, value string) (*proto.GetSetResponse, error) {
 	val, ok := d.lru.Get(key)
+
+	var oldValue string
+
 	if !ok {
-		return nil, errorx.NotKeyErr(key.Key)
+		oldValue = ""
+		strValue := stringx.NewStringSingle()
+		strValue.Set(value)
+		err := d.lru.Add(key, strValue)
+		if err != nil {
+			return nil, err
+		}
+
+	} else {
+		strVal, ok := val.(structure.StringXInterface)
+		if !ok {
+			return nil, errorx.DaoTypeErr("stringx")
+		}
+		oldValue = strVal.Get()
+		_, updateLength := strVal.Set(value)
+		d.lru.UpdateLruSize(updateLength)
 	}
 
-	strVal, ok := val.(structure.StringXInterface)
-	if !ok {
-		return nil, errorx.DaoTypeErr("stringx")
-	}
-
-	oldValue := strVal.Get()
-
-	_, updateLength := strVal.Set(value)
-	d.lru.UpdateLruSize(updateLength)
 	return &proto.GetSetResponse{Result: oldValue}, nil
 }
 
diff --git a/storage/dao/stringx_test.go b/storage/dao/stringx_test.go
index dab89b8..5d24a96 100644
--- a/storage/dao/stringx_test.go
+++ b/storage/dao/stringx_test.go
@@ -115,6 +115,11 @@ func TestDao_GetRange(t *testing.T) {
 	_, err = dao.GetRange(baseKey, 0, 7)
 	require.Error(t, err)
 
+	_, err = dao.Set(baseKey, "123456")
+	require.NoError(t, err)
+	resp, err = dao.GetRange(baseKey, 0, 3)
+	require.NoError(t, err)
+	require.Equal(t, resp.Result, "123")
 }
 
 func TestDao_GetSet(t *testing.T) {
@@ -124,14 +129,18 @@ func TestDao_GetSet(t *testing.T) {
 
 	_, err := dao.Set(baseKey, "a")
 	require.NoError(t, err)
-	resp, err := dao.GetSet(baseKey, "a")
+	resp, err := dao.GetSet(baseKey, "ab")
 	require.NoError(t, err)
 	require.Equal(t, resp.Result, "a")
 
-	// TODO 这个测试有问题，等待修复，问题详情: https://gitee.com/wheat-os/wheat-cache/issues/I4IV41
 	resp, err = dao.GetSet(baseKey, "s")
 	require.NoError(t, err)
-	require.Equal(t, resp.Result, nil)
+	require.Equal(t, resp.Result, "a")
+
+	l := proto.NewBaseKey("l")
+	resp, err = dao.GetSet(l, "s")
+	require.NoError(t, err)
+	require.Equal(t, resp.Result, "")
 }
 
 func TestDao_StrLen(t *testing.T) {