diff --git a/app/traits/spu/SkuTrait.php b/app/traits/spu/SkuTrait.php
index 21ed590..02f8a5e 100644
--- a/app/traits/spu/SkuTrait.php
+++ b/app/traits/spu/SkuTrait.php
@@ -62,6 +62,7 @@ trait SkuTrait
 
             $item->begin_at = $item->is_activity > 0 ? $item->limitTime['begin_at'] : '';
             $item->end_at   = $item->is_activity > 0 ? $item->limitTime['end_at'] : '';
+            $item->unit  = $item->spu->unit ?? '';
 
             unset($item->spu);
             unset($item->activity);