diff --git a/Learn.Archives.Core/Model/ExamClassTag.cs b/Learn.Archives.Core/Model/ExamClassTag.cs
index f8a3167..15e490e 100644
--- a/Learn.Archives.Core/Model/ExamClassTag.cs
+++ b/Learn.Archives.Core/Model/ExamClassTag.cs
@@ -66,7 +66,10 @@ namespace Learn.Archives.Core.Model
         /// 上线率
         /// </summary>
         [SugarColumn(IsIgnore = true)]
-        public decimal OnLineRate => OnLineCount / PeopleCount;
+        public decimal OnLineRate => (decimal)OnLineCount / (decimal)PeopleCount;
+        /// <summary>
+        /// 总人数
+        /// </summary>
         public int PeopleCount { get; set; }
         /// <summary>
         /// 上线人数