diff --git a/api/service/QuestionQaItem.go b/api/service/QuestionQaItem.go
index 49d9644..2a6da42 100644
--- a/api/service/QuestionQaItem.go
+++ b/api/service/QuestionQaItem.go
@@ -62,6 +62,28 @@ func (r *QuestionQaItemService) PutQuestionQaItemMust(itemId int64, req requests
 		return true, nil
 	}
 
+	// 检测必选数量
+	if req.IsMustSelect == 1 {
+		// 获取题库数据
+		questionQaDao := dao.QuestionQaDao{}
+		questionQa, err := questionQaDao.GetQuestionQaById(questionQaItem.QaId)
+		if err != nil {
+			return false, errors.New("题库错误")
+		}
+
+		maps := make(map[string]interface{})
+		maps["qa_id"] = questionQaItem.QaId
+		maps["is_must_select"] = 1
+		questionQaItems, err := questionQaItemDao.GetQuestionQaItemList(maps)
+		if err != nil {
+			return false, errors.New("内部错误")
+		}
+
+		if len(questionQaItems) > questionQa.QaQuantity {
+			return false, errors.New("必选题目已超出题库所需数量")
+		}
+	}
+
 	// 开始事务
 	tx := global.Db.Begin()
 	defer func() {