diff --git a/Falcon.SugarApi/TimedBackgroundTask/CronExpression.cs b/Falcon.SugarApi/TimedBackgroundTask/CronExpression.cs
index aa0f2e1..b60680b 100644
--- a/Falcon.SugarApi/TimedBackgroundTask/CronExpression.cs
+++ b/Falcon.SugarApi/TimedBackgroundTask/CronExpression.cs
@@ -12,31 +12,31 @@ public class CronExpression
     /// <summary>
     /// 可选的秒范围枚举
     /// </summary>
-    public List<int> Seconds { get; }
+    private List<int> Seconds { get; }
     /// <summary>
     /// 可选的分范围枚举
     /// </summary>
-    public List<int> Minutes { get; }
+    private List<int> Minutes { get; }
     /// <summary>
     /// 可选的时范围枚举
     /// </summary>
-    public List<int> Hours { get; }
+    private List<int> Hours { get; }
     /// <summary>
     /// 可选的天范围枚举
     /// </summary>
-    public List<int> DaysOfMonth { get; }
+    private List<int> DaysOfMonth { get; }
     /// <summary>
     /// 可选的月范围枚举
     /// </summary>
-    public List<int> Months { get; }
+    private List<int> Months { get; }
     /// <summary>
     /// 可选的星期范围枚举
     /// </summary>
-    public List<int> DaysOfWeek { get; }
+    private List<int> DaysOfWeek { get; }
     /// <summary>
     /// 可选的年范围枚举
     /// </summary>
-    public List<int> Years { get; set; }
+    private List<int> Years { get; set; }
 
     /// <summary>
     /// 通过提供cron表达式构造对象