diff --git a/game/room/seat.go b/game/room/seat.go
index 5878991..8c722c1 100644
--- a/game/room/seat.go
+++ b/game/room/seat.go
@@ -73,6 +73,7 @@ func (slf *Seat[PlayerID, P, R]) RemoveSeat(id PlayerID) {
 	slf.mutex.Lock()
 	defer slf.mutex.Unlock()
 	seat := slf.seatPS.DeleteGet(id)
+	slf.vacancy = append(slf.vacancy, seat)
 	slf.seatSP[seat] = nil
 }
 
@@ -116,6 +117,7 @@ func (slf *Seat[PlayerID, P, R]) SetSeat(id PlayerID, seat int) int {
 		}
 		slf.seatSP[seat] = slf.seatSP[oldSeat]
 		slf.seatSP[oldSeat] = nil
+		slf.vacancy = append(slf.vacancy, oldSeat)
 		slf.seatPS.Set(id, seat)
 	}
 	slf.event.OnPlayerSeatChangeEvent(slf.room, slf.manager.GetPlayer(id), oldSeat, seat)
diff --git a/game/room/seat_test.go b/game/room/seat_test.go
new file mode 100644
index 0000000..d479341
--- /dev/null
+++ b/game/room/seat_test.go
@@ -0,0 +1,54 @@
+package room_test
+
+import (
+	"fmt"
+	"github.com/kercylan98/minotaur/game/room"
+	"github.com/kercylan98/minotaur/server"
+	"testing"
+)
+
+type Player struct {
+}
+
+func (slf *Player) GetID() string {
+	return ""
+}
+
+func (slf *Player) GetConn() *server.Conn {
+	return nil
+}
+
+func (slf *Player) UseConn(conn *server.Conn) {
+
+}
+
+func (slf *Player) Close(err ...error) {
+
+}
+
+type Room struct {
+}
+
+func (slf *Room) GetGuid() int64 {
+	return 0
+}
+
+func TestSeat_SetSeat(t *testing.T) {
+	rm := room.NewManager[string, *Player, *Room]()
+
+	r := &Room{}
+	rm.CreateRoom(r)
+	helper := rm.GetHelper(r)
+	helper.AddSeat("a")
+	helper.AddSeat("b")
+	helper.RemoveSeat("a")
+	helper.AddSeat("c")
+
+	for i, s := range helper.GetSeatInfo() {
+		if s == nil {
+			fmt.Println(i, "nil")
+		} else {
+			fmt.Println(i, *s)
+		}
+	}
+}
diff --git a/go.sum b/go.sum
index 3664cde..830e467 100644
--- a/go.sum
+++ b/go.sum
@@ -274,6 +274,7 @@ golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
 golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
 golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.12.0 h1:/ZfYdc3zq+q02Rv9vGqTeSItdzZTSNDmfTi0mBAuidU=