diff --git a/Entity/System/Inventory.cs b/Entity/System/Inventory.cs
index 863469a..7b49557 100644
--- a/Entity/System/Inventory.cs
+++ b/Entity/System/Inventory.cs
@@ -73,7 +73,7 @@ namespace Milimoe.FunGame.Core.Entity
         /// <summary>
         /// 练级中的角色
         /// </summary>
-        public Dictionary<Character, DateTime> Training { get; set; } = [];
+        public Dictionary<long, DateTime> Training { get; set; } = [];
 
         private Character? _character;
 
diff --git a/Library/Common/JsonConverter/InventoryConverter.cs b/Library/Common/JsonConverter/InventoryConverter.cs
index c343d4e..33ba6ba 100644
--- a/Library/Common/JsonConverter/InventoryConverter.cs
+++ b/Library/Common/JsonConverter/InventoryConverter.cs
@@ -54,10 +54,10 @@ namespace Milimoe.FunGame.Core.Library.Common.JsonConverter
                     }
                     break;
                 case nameof(Inventory.Training):
-                    Dictionary<Character, DateTime> training = NetworkUtility.JsonDeserialize<Dictionary<Character, DateTime>>(ref reader, options) ?? [];
-                    foreach (Character character in training.Keys)
+                    Dictionary<long, DateTime> training = NetworkUtility.JsonDeserialize<Dictionary<long, DateTime>>(ref reader, options) ?? [];
+                    foreach (long cid in training.Keys)
                     {
-                        result.Training.Add(character, training[character]);
+                        result.Training.Add(cid, training[cid]);
                     }
                     break;
             }
diff --git a/Library/Common/JsonConverter/UserConverter.cs b/Library/Common/JsonConverter/UserConverter.cs
index adbd1d6..50cf055 100644
--- a/Library/Common/JsonConverter/UserConverter.cs
+++ b/Library/Common/JsonConverter/UserConverter.cs
@@ -80,9 +80,9 @@ namespace Milimoe.FunGame.Core.Library.Common.JsonConverter
                     {
                         result.Inventory.Squad.Add(character);
                     }
-                    foreach (Character character in inventory.Training.Keys)
+                    foreach (long cid in inventory.Training.Keys)
                     {
-                        result.Inventory.Training[character] = inventory.Training[character];
+                        result.Inventory.Training[cid] = inventory.Training[cid];
                     }
                     break;
             }