diff --git a/scene/little_game/书架/书架.gd b/scene/little_game/书架/书架.gd
index 88b94569..d7b5db9f 100644
--- a/scene/little_game/书架/书架.gd
+++ b/scene/little_game/书架/书架.gd
@@ -65,7 +65,11 @@ func _init_answer_and_connect_signals() -> void:
 			arr.append(id)
 			var book = _get_book_by_id(row, id)
 			if not Engine.is_editor_hint():
-				book.get_node("BookButton").pressed.connect(_on_book_pressed.bind(row, id))
+				var btn = book.get_node("BookButton") as TextureButton
+				btn.pressed.connect(_on_book_pressed.bind(row, id))
+				btn.mouse_entered.connect(_on_book_hover.bind(true, row, btn))
+				btn.mouse_exited.connect(_on_book_hover.bind(false, row, btn))
+				btn.self_modulate = Color.GRAY
 		current_answer.append(arr)
 
 
@@ -131,6 +135,15 @@ func _on_book_pressed(row: int, id: int) -> void:
 			selected_book = [row, col]
 
 
+func _on_book_hover(hover: bool, row: int, btn: TextureButton) -> void:
+	if gameover or row_correct_status[row]:
+		return
+	if hover:
+		btn.self_modulate = Color.WHITE
+	else:
+		btn.self_modulate = Color.GRAY
+
+
 func _get_book_by_id(row: int, id: int) -> Node2D:
 	return get_node("./Shelf/Layer" + str(row) + "/Book" + str(id))
 
@@ -199,6 +212,11 @@ func _check_answer() -> void:
 		if row_success:
 			row_correct_status[0] = true
 			$SfxRowSuccess.play()
+			# set modulate back to white
+			for col in range(row1.size()):
+				var book = _get_book_by_id(0, col)
+				var btn = book.get_node("BookButton") as TextureButton
+				btn.self_modulate = Color.WHITE
 
 	# 第二行需要正序排列
 	if not row_correct_status[1]:
@@ -212,6 +230,12 @@ func _check_answer() -> void:
 		if row_success:
 			row_correct_status[1] = true
 			$SfxRowSuccess.play()
+			# set modulate back to white
+			for col in range(row2.size()):
+				var book = _get_book_by_id(1, col)
+				var btn = book.get_node("BookButton") as TextureButton
+				btn.self_modulate = Color.WHITE
+
 	# 第三行正序或者倒序都可以
 	if not row_correct_status[2]:
 		var row_success = true
@@ -232,6 +256,11 @@ func _check_answer() -> void:
 		if row_success:
 			row_correct_status[2] = true
 			$SfxRowSuccess.play()
+			# set modulate back to white
+			for col in range(_row3.size()):
+				var book = _get_book_by_id(2, col)
+				var btn = book.get_node("BookButton") as TextureButton
+				btn.self_modulate = Color.WHITE
 	# 检查是否成功
 	if row_correct_status[0] and row_correct_status[1] and row_correct_status[2]:
 		_success()