diff --git a/src/game/CardTile.cpp b/src/game/CardTile.cpp
index 61fe975..986112c 100644
--- a/src/game/CardTile.cpp
+++ b/src/game/CardTile.cpp
@@ -51,8 +51,6 @@ namespace UNO::GAME {
 
     void CardTile::shuffle()
     {
-        std::random_device rd;
-        std::mt19937 gen(rd());
         std::ranges::shuffle(cards_, COMMON::Utils::getInstance()->getRandom().getGenerator());
     }
 
@@ -68,7 +66,7 @@ namespace UNO::GAME {
         this->pushFront(card);
     }
 
-    Card DiscardPile::getFront()
+    Card DiscardPile::getFront() const
     {
         return this->front();
     }
diff --git a/src/game/CardTile.h b/src/game/CardTile.h
index 476ed7f..51ba6e9 100644
--- a/src/game/CardTile.h
+++ b/src/game/CardTile.h
@@ -87,7 +87,7 @@ namespace UNO::GAME {
         /**
          * @return 牌堆中最上方的牌
          */
-        Card getFront();
+        Card getFront() const;
     };
 
     /**