diff --git a/backend/app/api/pl/public_transport.py b/backend/app/api/pl/public_transport.py
index 0fa5da43e..2a449efb3 100644
--- a/backend/app/api/pl/public_transport.py
+++ b/backend/app/api/pl/public_transport.py
@@ -46,6 +46,7 @@ from app.schemas.pl.transport import (
 )
 from app.services.pl_dibang_bridge_service import plan_has_load_stop
 from app.services.pl_feedback_brand_qty import (
+    driver_feedback_enforces_brand,
     persist_transport_product_feedback,
     require_brand_qtys_if_needed,
 )
@@ -796,7 +797,7 @@ def save_public_driver_stop_feedback(
                     required_brand_id=plan_product.brand_id if plan_product else None,
                     actual_qty=actual_qty,
                     rows=brand_qtys,
-                    enforce=True,
+                    enforce=driver_feedback_enforces_brand(brand_qtys),
                 )
             except ValueError as exc:
                 return error_response(400, str(exc))
diff --git a/backend/app/services/pl_driver_plan_service.py b/backend/app/services/pl_driver_plan_service.py
index f1721db13..44495df5e 100644
--- a/backend/app/services/pl_driver_plan_service.py
+++ b/backend/app/services/pl_driver_plan_service.py
@@ -31,6 +31,7 @@ from app.schemas.pl.transport import (
     PublicTransportPageRead,
 )
 from app.services.pl_feedback_brand_qty import (
+    driver_feedback_enforces_brand,
     persist_transport_product_feedback,
     require_brand_qtys_if_needed,
 )
@@ -552,7 +553,7 @@ def save_driver_stop_feedback_for_plan(
                     required_brand_id=plan_product.brand_id if plan_product else None,
                     actual_qty=actual_qty,
                     rows=brand_qtys,
-                    enforce=True,
+                    enforce=driver_feedback_enforces_brand(brand_qtys),
                 )
             except ValueError as exc:
                 return False, str(exc)
diff --git a/backend/app/services/pl_feedback_brand_qty.py b/backend/app/services/pl_feedback_brand_qty.py
index 55136ad8b..e8b43135b 100644
--- a/backend/app/services/pl_feedback_brand_qty.py
+++ b/backend/app/services/pl_feedback_brand_qty.py
@@ -20,6 +20,16 @@ def format_brand_qty_summary(rows: list[dict]) -> Optional[str]:
     return " / ".join(parts) if parts else None
 
 
+def driver_feedback_enforces_brand(rows: Optional[list]) -> bool:
+    """司机回执未填品牌数量时不拦截单据保存；已填写则继续校验。"""
+    for row in rows or []:
+        if not isinstance(row, dict):
+            continue
+        if Decimal(str(row.get("qty") or 0)) > 0:
+            return True
+    return False
+
+
 def require_brand_qtys_if_needed(
     *,
     brand_mode: Optional[str],
diff --git a/backend/tests/test_pl_feedback_brand_qty.py b/backend/tests/test_pl_feedback_brand_qty.py
index f6e2d0303..8a3c9c1cc 100644
--- a/backend/tests/test_pl_feedback_brand_qty.py
+++ b/backend/tests/test_pl_feedback_brand_qty.py
@@ -2,7 +2,11 @@ from decimal import Decimal
 
 import pytest
 
-from app.services.pl_feedback_brand_qty import format_brand_qty_summary, require_brand_qtys_if_needed
+from app.services.pl_feedback_brand_qty import (
+    driver_feedback_enforces_brand,
+    format_brand_qty_summary,
+    require_brand_qtys_if_needed,
+)
 
 
 def test_format_brand_qty_summary():
@@ -41,6 +45,29 @@ def test_require_skips_when_not_enforced():
     )
 
 
+def test_driver_feedback_missing_brand_qty_does_not_block_save():
+    rows = []
+    require_brand_qtys_if_needed(
+        brand_mode="required",
+        required_brand_id="b1",
+        actual_qty=Decimal("0"),
+        rows=rows,
+        enforce=driver_feedback_enforces_brand(rows),
+    )
+
+
+def test_driver_feedback_still_checks_brand_qty_when_submitted():
+    rows = [{"brandId": "b1", "qty": Decimal("3")}]
+    with pytest.raises(ValueError, match="必须等于"):
+        require_brand_qtys_if_needed(
+            brand_mode="required",
+            required_brand_id="b1",
+            actual_qty=Decimal("10"),
+            rows=rows,
+            enforce=driver_feedback_enforces_brand(rows),
+        )
+
+
 def test_require_enforces_when_completed():
     with pytest.raises(ValueError, match="至少一个品牌数量"):
         require_brand_qtys_if_needed(
diff --git a/miniprogram/utils/__tests__/portalEnvelope.test.mjs b/miniprogram/utils/__tests__/portalEnvelope.test.mjs
new file mode 100644
index 000000000..0507ca985
--- /dev/null
+++ b/miniprogram/utils/__tests__/portalEnvelope.test.mjs
@@ -0,0 +1,30 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { portalBusinessErrorMessage } from '../portalEnvelope.js'
+
+test('portal business failure keeps the server message', () => {
+  assert.equal(
+    portalBusinessErrorMessage({
+      code: 400,
+      message: '有品牌产品须填写至少一个品牌数量',
+      data: null
+    }),
+    '有品牌产品须填写至少一个品牌数量'
+  )
+})
+
+test('portal success and raw payloads are not errors', () => {
+  assert.equal(
+    portalBusinessErrorMessage({ code: 200, message: 'success', data: { success: true } }),
+    null
+  )
+  assert.equal(portalBusinessErrorMessage({ code: 0, msg: 'ok' }), null)
+  assert.equal(portalBusinessErrorMessage({ id: 'plan-1', planNo: 'PO1' }), null)
+  assert.equal(portalBusinessErrorMessage({ code: 'ABC', name: '地磅单据' }), null)
+  assert.equal(portalBusinessErrorMessage(null), null)
+})
+
+test('portal failure without a message still fails', () => {
+  assert.equal(portalBusinessErrorMessage({ code: '400', data: null }), '请求失败')
+})
diff --git a/miniprogram/utils/dbRequest.js b/miniprogram/utils/dbRequest.js
index f848079a6..e2f91cd5a 100644
--- a/miniprogram/utils/dbRequest.js
+++ b/miniprogram/utils/dbRequest.js
@@ -1,8 +1,9 @@
 /**
- * 地磅模块 HTTP（裸 JSON，非门户 code/data 信封）
+ * 地磅与运输小程序 HTTP。裸 JSON 原样返回；门户信封在 HTTP 200 下若 code 不是 200/0，按业务失败处理。
  * 对齐 mobile-h5/src/utils/http/db.ts
  */
 import { TOKEN_KEY, REFRESH_TOKEN_KEY, USER_INFO_KEY, resolveApiBase } from '@/config/api'
+import { portalBusinessErrorMessage } from '@/utils/portalEnvelope'
 
 const DB_COLLECTION_ROOT = /^\/(plans|inventory|weighing)$/
 
@@ -83,6 +84,14 @@ export function dbRequest(options = {}) {
           return
         }
         if (status >= 200 && status < 300) {
+          const businessError = portalBusinessErrorMessage(data)
+          if (businessError) {
+            if (showError) {
+              uni.showToast({ title: businessError.slice(0, 40), icon: 'none' })
+            }
+            reject(new Error(businessError))
+            return
+          }
           resolve(data)
           return
         }
diff --git a/miniprogram/utils/portalEnvelope.js b/miniprogram/utils/portalEnvelope.js
new file mode 100644
index 000000000..206bb3393
--- /dev/null
+++ b/miniprogram/utils/portalEnvelope.js
@@ -0,0 +1,15 @@
+/**
+ * 门户信封 { code, message, data } 的业务失败文案。
+ * HTTP 200 仍可能携带 code=400；code 缺失或非数字时视为裸 JSON。
+ * @param {unknown} data
+ * @returns {string | null}
+ */
+export function portalBusinessErrorMessage(data) {
+  if (!data || typeof data !== 'object' || Array.isArray(data)) return null
+  if (!Object.prototype.hasOwnProperty.call(data, 'code')) return null
+  const code = Number(data.code)
+  if (!Number.isFinite(code) || code === 200 || code === 0) return null
+  const message = typeof data.message === 'string' ? data.message.trim() : ''
+  const msg = typeof data.msg === 'string' ? data.msg.trim() : ''
+  return message || msg || '请求失败'
+}