diff --git a/platform/modules/v1/controllers/ErpController.php b/platform/modules/v1/controllers/ErpController.php
index 7c4b780..228ef53 100644
--- a/platform/modules/v1/controllers/ErpController.php
+++ b/platform/modules/v1/controllers/ErpController.php
@@ -219,11 +219,18 @@ class ErpController extends Controller
         $factor = $drugFactorMap[$drugId] ?? 1;
         $originQty = (int) ($item['number'] ?? 0);
         $erpQty = (int) round($originQty * $factor);
+        $scale = 2; // 金额一般保留 2 位小数
+        $buyPrice = $item['buy_price'];
+        if (bccomp($factor, '1', $scale) === 1) {
+            $erpPaymentPrice = bcdiv($buyPrice, $factor, $scale);
+        } else {
+            $erpPaymentPrice = $buyPrice;
+        }
         return [
             'detailId' => $item['id'],
             'productSku' => $item['drug_no'],
             'quantity' => $erpQty,
-            'paymentPrice' => $item['buy_price'],
+            'paymentPrice' => $erpPaymentPrice,
             'price' => round($originQty * $item['buy_price'], 2),
         ];
     }