diff --git a/redis.pb.go b/redis.pb.go
index 7446ab3..eaf6ecf 100644
--- a/redis.pb.go
+++ b/redis.pb.go
@@ -59,7 +59,7 @@ func (m *GetRequest) GetKey() string {
 type SetRequest struct {
 	Key              *string `protobuf:"bytes,1,opt,name=key" json:"key,omitempty"`
 	Value            *string `protobuf:"bytes,2,opt,name=value" json:"value,omitempty"`
-	Ttl              *string `protobuf:"bytes,3,opt,name=ttl" json:"ttl,omitempty"`
+	Ttl              *uint64 `protobuf:"varint,3,opt,name=ttl" json:"ttl,omitempty"`
 	XXX_unrecognized []byte  `json:"-"`
 }
 
@@ -81,11 +81,11 @@ func (m *SetRequest) GetValue() string {
 	return ""
 }
 
-func (m *SetRequest) GetTtl() string {
+func (m *SetRequest) GetTtl() uint64 {
 	if m != nil && m.Ttl != nil {
 		return *m.Ttl
 	}
-	return ""
+	return 0
 }
 
 type DelRequest struct {
diff --git a/redis.proto b/redis.proto
index aa0a5e2..fdf2bec 100644
--- a/redis.proto
+++ b/redis.proto
@@ -9,7 +9,7 @@ message GetRequest {
 message SetRequest {
 	string key = 1;
 	string value = 2;
-	string ttl = 3;
+	uint64 ttl = 3;
 }
 message DelRequest {
 	string key = 1;
diff --git a/string.go b/string.go
index 1cec089..fe266d5 100644
--- a/string.go
+++ b/string.go
@@ -30,7 +30,7 @@ func GetString(key string, url ...string) (string, error) {
 }
 
 //设置
-func Set(key, value string, ttl string, url ...string) (string, error) {
+func Set(key, value string, ttl uint64, url ...string) (string, error) {
 
 	conn, _, err := Conn(url...)
 
@@ -39,7 +39,7 @@ func Set(key, value string, ttl string, url ...string) (string, error) {
 	}
 	defer conn.Close()
 
-	req := &SetRequest{proto.String(key), proto.String(value), proto.String(ttl), nil}
+	req := &SetRequest{proto.String(key), proto.String(value), proto.Uint64(ttl), nil}
 
 	res := &SetResponse{}
 
diff --git a/string_test.go b/string_test.go
index 647e93a..14428bd 100644
--- a/string_test.go
+++ b/string_test.go
@@ -15,7 +15,7 @@ func Test_Get(t *testing.T) {
 
 func Test_Set(t *testing.T) {
 
-	c, err := Set("test", "1111", "7200")
+	c, err := Set("test", "1111", 7200)
 	t.Log(c)
 	t.Log(err)