diff --git a/app/schemas/box.py b/app/schemas/box.py
index 85bea8a..70bc844 100644
--- a/app/schemas/box.py
+++ b/app/schemas/box.py
@@ -8,6 +8,7 @@ ZONGPAI_PATTERN = re.compile(r"^(\d{2}(B|C|T)\d+|\d{2}(BW|CW)\d{4})$")
 class BoxItemDetail(BaseModel):
     """箱号下某个总排号的明细"""
     zongpai_no: str
+    work_order_no: str | None = None
     quantity: int
 
 
@@ -21,6 +22,7 @@ class BoxInfoResponse(BaseModel):
     """GET /box/info 响应"""
     zongpai_no: str
     paichan_no: str
+    work_order_no: str | None = None
     quantity: int
     existing_boxes: list[BoxDetail]
     max_box_no: int
diff --git a/app/services/box_service.py b/app/services/box_service.py
index 11aa676..ea12962 100644
--- a/app/services/box_service.py
+++ b/app/services/box_service.py
@@ -1,6 +1,6 @@
 import re
 
-from sqlalchemy import text
+from sqlalchemy import bindparam, text
 from sqlalchemy.orm import Session
 
 from app.models.finished_goods import FinishedGoodsBox, FinishedGoodsBoxItem
@@ -31,7 +31,7 @@ class DuplicateZongpaiBindError(Exception):
 
 
 def query_erp_info(db: Session, zongpai_no: str) -> dict:
-    """从 ERP 视图查询总排号对应的排产号和数量。"""
+    """从 ERP 视图查询总排号对应的排产号、工令号和数量。"""
     sql = text(_erp_info_sql(db))
     row = db.execute(sql, {"zongpai_no": zongpai_no}).fetchone()
     if not row:
@@ -40,6 +40,7 @@ def query_erp_info(db: Session, zongpai_no: str) -> dict:
         "zongpai_no": row[0],
         "paichan_no": row[1],
         "quantity": int(row[2]),
+        "work_order_no": row[3],
     }
 
 
@@ -47,18 +48,43 @@ def _erp_info_sql(db: Session) -> str:
     dialect_name = db.bind.dialect.name if db.bind is not None else ""
     if dialect_name == "postgresql":
         return (
-            'SELECT "总排号", "排产号", "数量" '
+            'SELECT "总排号", "排产号", "数量", "工令号" '
             'FROM "ERPAuto"."vw_productionContractData" '
             'WHERE "总排号" = :zongpai_no '
             "LIMIT 1"
         )
     return (
-        "SELECT TOP 1 [总排号], [排产号], [数量] "
+        "SELECT TOP 1 [总排号], [排产号], [数量], [工令号] "
         "FROM [ERPAuto].[vw_productionContractData] "
         "WHERE [总排号] = :zongpai_no"
     )
 
 
+def query_erp_work_order_map(db: Session, zongpai_nos: list[str]) -> dict[str, str | None]:
+    """批量查询总排号对应的工令号。"""
+    if not zongpai_nos:
+        return {}
+
+    dialect_name = db.bind.dialect.name if db.bind is not None else ""
+    if dialect_name == "postgresql":
+        sql = text(
+            'SELECT "总排号", "工令号" '
+            'FROM "ERPAuto"."vw_productionContractData" '
+            'WHERE "总排号" IN :zongpai_nos'
+        )
+    else:
+        sql = text(
+            "SELECT [总排号], [工令号] "
+            "FROM [ERPAuto].[vw_productionContractData] "
+            "WHERE [总排号] IN :zongpai_nos"
+        )
+    rows = db.execute(
+        sql.bindparams(bindparam("zongpai_nos", expanding=True)),
+        {"zongpai_nos": sorted(set(zongpai_nos))},
+    ).fetchall()
+    return {row[0]: row[1] for row in rows}
+
+
 def get_box_info(db: Session, zongpai_no: str) -> dict:
     """获取装箱信息：排产号、数量、已有箱号明细。"""
     zongpai_no = zongpai_no.strip().upper()
@@ -75,18 +101,31 @@ def get_box_info(db: Session, zongpai_no: str) -> dict:
         .all()
     )
 
-    existing_boxes = []
-    max_box_no = 0
+    box_items = {}
+    item_zongpai_nos = []
     for box in boxes:
         items = (
             db.query(FinishedGoodsBoxItem)
             .filter(FinishedGoodsBoxItem.box_id == box.id)
             .all()
         )
+        box_items[box.id] = items
+        item_zongpai_nos.extend(item.zongpai_no for item in items)
+
+    work_order_map = query_erp_work_order_map(db, item_zongpai_nos)
+
+    existing_boxes = []
+    max_box_no = 0
+    for box in boxes:
+        items = box_items[box.id]
         existing_boxes.append({
             "box_no": box.box_no,
             "items": [
-                {"zongpai_no": item.zongpai_no, "quantity": int(item.quantity or 0)}
+                {
+                    "zongpai_no": item.zongpai_no,
+                    "work_order_no": work_order_map.get(item.zongpai_no),
+                    "quantity": int(item.quantity or 0),
+                }
                 for item in items
             ],
         })
@@ -96,6 +135,7 @@ def get_box_info(db: Session, zongpai_no: str) -> dict:
     return {
         "zongpai_no": zongpai_no,
         "paichan_no": paichan_no,
+        "work_order_no": erp["work_order_no"],
         "quantity": quantity,
         "existing_boxes": existing_boxes,
         "max_box_no": max_box_no,
diff --git a/tests/test_box_api.py b/tests/test_box_api.py
index d11899e..a91d100 100644
--- a/tests/test_box_api.py
+++ b/tests/test_box_api.py
@@ -13,6 +13,8 @@ def test_box_info_success(client: TestClient):
     data = resp.json()
     assert data["zongpai_no"] == "26BW0011"
     assert data["paichan_no"] == "W00009"
+    assert "work_order_no" in data
+    assert data["work_order_no"] is None or isinstance(data["work_order_no"], str)
     assert data["quantity"] == 80
     assert "existing_boxes" in data
     assert "max_box_no" in data