diff --git a/README.md b/README.md
index 6868d9d..3b3a126 100644
--- a/README.md
+++ b/README.md
@@ -33,4 +33,19 @@ result,err := caches.Delete("key2")
 
 // Delete More
 result,err = caches.Delete("key2","key3","key4")
+
+// already redis connect client
+rdsClient := redis.NewClient(&redis.Options{
+    Addr:     fmt.Sprintf("%s:%s", "192.168.0.151", "6379"),
+    Password: "",
+    DB:       15,
+})
+
+// WithRedisClient() 使用已有的redis链接客户端 
+// WithOriginDB() 是否使用已经的客户端的数据库 true - 使用已有的客户端链接数据库 | false - 使用WithDB()中的数据库，如果为空默认使用0库
+// WithDB() 指定数据库，如果 WithOriginDB() 为false，WithDB()未指定的话默认使用0号库
+
+caches := NewCache(WithRedisClient(rdsClient), WithOriginDB(true), WithDB(11))
+
+
 ```
\ No newline at end of file
diff --git a/cache.go b/cache.go
index 70acf08..561bb0e 100644
--- a/cache.go
+++ b/cache.go
@@ -8,11 +8,12 @@ import (
 )
 
 type config struct {
-	Host     string
-	Port     string
-	Password string
-	DB       int
-	Client   *redis.Client
+	Host     string        // redis主机
+	Port     string        // redis 端口
+	Password string        // redis 密码
+	DB       int           // redis库名
+	Client   *redis.Client // redis链接客户端 【如果项目中已经有了redis链接可使用该参数】
+	OriginDB bool          // 是否强制使用redis客户端【Client】的DB
 }
 
 type Option func(ca *config)
@@ -47,6 +48,12 @@ func WithDB(db int) Option {
 	}
 }
 
+func WithOriginDB(originDB bool) Option {
+	return func(ca *config) {
+		ca.OriginDB = originDB
+	}
+}
+
 type Cache interface {
 	// Put 放入缓存
 	Put(key string, value interface{}, ttl time.Duration) error
@@ -81,6 +88,9 @@ func NewCache(opts ...Option) Cache {
 		})
 	} else {
 		rClient.client = cha.Client
+		if cha.OriginDB == false {
+			rClient.client.Options().DB = cha.DB
+		}
 	}
 
 	rClient.ctx = context.Background()
diff --git a/cache_test.go b/cache_test.go
index 3a93589..eafe242 100644
--- a/cache_test.go
+++ b/cache_test.go
@@ -2,6 +2,7 @@ package rds_cache_go
 
 import (
 	"fmt"
+	"github.com/go-redis/redis/v8"
 	"testing"
 	"time"
 )
@@ -36,3 +37,15 @@ func TestCache_Delete(t *testing.T) {
 	resunt := caches.Delete("key1", "key2")
 	fmt.Println(resunt)
 }
+
+func TestCache_RdsClient(t *testing.T) {
+	client := redis.NewClient(&redis.Options{
+		Addr:     fmt.Sprintf("%s:%s", "192.168.0.151", "6379"),
+		Password: "",
+		DB:       15,
+	})
+
+	cachess := NewCache(WithRedisClient(client), WithOriginDB(true), WithDB(11))
+
+	cachess.Put("this key", "this aaaaa", 1*time.Minute)
+}