diff --git a/app/service/AdsInsightService.php b/app/service/AdsInsightService.php
index 8d26de5..e45fadb 100644
--- a/app/service/AdsInsightService.php
+++ b/app/service/AdsInsightService.php
@@ -525,7 +525,7 @@ class AdsInsightService
 
         // 计算 ROAS
         $roas = $total_spend == 0 ? '-' : round($total_purchases_value / $total_spend, 2);
-        $cost_per_purchase = $total_purchases == 0? '-' : round($total_spend / $total_purchases, 2);
+        $cost_per_purchase = $total_purchases == 0? 0 : round($total_spend / $total_purchases, 2);
         // 计算 CTR
         $ctr = $total_impressions > 0 ? number_format(($total_clicks / $total_impressions) * 100, 2) . '%' : '-';