diff --git a/popcorn/Assets/Joypac/Scripts/JoypacAnalyticsManager.cs b/popcorn/Assets/Joypac/Scripts/JoypacAnalyticsManager.cs
index 7dbd4a48..5c0dedfe 100644
--- a/popcorn/Assets/Joypac/Scripts/JoypacAnalyticsManager.cs
+++ b/popcorn/Assets/Joypac/Scripts/JoypacAnalyticsManager.cs
@@ -944,10 +944,16 @@ public class JoypacAdjustFinder
     public string adjust_trackerName = "";
     [SerializeField]
     public string adjust_campaign = "";
+    /*只有在AdjustConfig 中通过调用 setNeedsCost 方法来进行配置后，
+     * costType、 costAmount 和 costCurrency 成本数据才可用。
+     * 如果未进行配置，或已配置但这些字段不属于归因的一部分，那么字段值就会为 null。
+     可以试一下，另外，这个应该只能获取到少部分cost。
+    目前很多渠道的cost是通过API获取的，通过API获取这种非实时，归因回传这里肯定就拿不到相关数据了。
+     */
     [SerializeField]
     public string adjust_costType = "";
     [SerializeField]
-    public double? adjust_costAmount = 0.0d;
+    public float? adjust_costAmount = null;
     [SerializeField]
     public string adjust_costCurrency = "";
 
@@ -963,7 +969,7 @@ public class JoypacAdjustFinder
         adjust_trackerName = attribution.trackerName;
         adjust_campaign = attribution.campaign;
         adjust_costType = attribution.costType;
-        adjust_costAmount = attribution.costAmount;
+        adjust_costAmount = (float)attribution.costAmount;
         adjust_costCurrency = attribution.costCurrency;
 
     }