diff --git a/backend/app/services/bx/base.py b/backend/app/services/bx/base.py
index 489dad637..e4f267be2 100644
--- a/backend/app/services/bx/base.py
+++ b/backend/app/services/bx/base.py
@@ -45,6 +45,7 @@ class BxCrudService:
         *,
         user: Optional["BxUserContext"] = None,
         skip_scope: bool = False,
+        order_by: Optional[Any] = None,
     ) -> Tuple[Sequence[M], int]:
         query = db.query(model).filter(model.tenant_no == tenant_no)
         if hasattr(model, "del_flag"):
@@ -54,7 +55,9 @@ class BxCrudService:
         if user and not skip_scope:
             query = apply_bx_scope(query, model, user, db, tenant_no)
         total = query.count()
-        if hasattr(model, "sort_order"):
+        if order_by is not None:
+            query = query.order_by(order_by)
+        elif hasattr(model, "sort_order"):
             query = query.order_by(model.sort_order.asc(), model.create_time.desc())
         else:
             query = query.order_by(model.create_time.desc())
diff --git a/backend/app/services/bx/list_sort.py b/backend/app/services/bx/list_sort.py
new file mode 100644
index 000000000..e5343fd53
--- /dev/null
+++ b/backend/app/services/bx/list_sort.py
@@ -0,0 +1,53 @@
+from __future__ import annotations
+
+from typing import Optional
+
+from app.models.bx_models import (
+    BxAdvanceApply,
+    BxInvoice,
+    BxInvoiceLedger,
+    BxReimburseApply,
+)
+from app.services.crm.list_sort import resolve_datetime_order_by
+
+ADVANCE_WHITELIST = {
+    "applyTime": BxAdvanceApply.create_time,
+    "issueTime": BxAdvanceApply.issue_time,
+}
+REIMBURSE_WHITELIST = {
+    "applyTime": BxReimburseApply.create_time,
+    "payTime": BxReimburseApply.pay_time,
+}
+INVOICE_WHITELIST = {"createTime": BxInvoice.create_time}
+LEDGER_WHITELIST = {"createTime": BxInvoiceLedger.create_time}
+
+
+def order_advance(sort_field: Optional[str], sort_order: Optional[str], default=None):
+    if default is None:
+        default = BxAdvanceApply.create_time.desc()
+    return resolve_datetime_order_by(sort_field, sort_order, ADVANCE_WHITELIST, default)
+
+
+def order_reimburse(sort_field: Optional[str], sort_order: Optional[str], default=None):
+    if default is None:
+        default = BxReimburseApply.create_time.desc()
+    return resolve_datetime_order_by(sort_field, sort_order, REIMBURSE_WHITELIST, default)
+
+
+def order_invoice(sort_field: Optional[str], sort_order: Optional[str], default=None):
+    if default is None:
+        default = BxInvoice.create_time.desc()
+    return resolve_datetime_order_by(sort_field, sort_order, INVOICE_WHITELIST, default)
+
+
+def order_ledger(sort_field: Optional[str], sort_order: Optional[str], default=None):
+    if default is None:
+        default = BxInvoiceLedger.create_time.desc()
+    return resolve_datetime_order_by(sort_field, sort_order, LEDGER_WHITELIST, default)
+
+
+def parse_sort_params(params: dict) -> tuple:
+    """从 request/body dict 取 sortField/sortOrder（兼容 snake）。"""
+    sf = params.get("sortField") or params.get("sort_field")
+    so = params.get("sortOrder") or params.get("sort_order")
+    return (str(sf).strip() if sf else None), (str(so).strip() if so else None)
diff --git a/backend/tests/test_bx_list_sort.py b/backend/tests/test_bx_list_sort.py
new file mode 100644
index 000000000..1314369bd
--- /dev/null
+++ b/backend/tests/test_bx_list_sort.py
@@ -0,0 +1,52 @@
+# backend/tests/test_bx_list_sort.py
+from app.models.bx_models import BxAdvanceApply, BxInvoice, BxInvoiceLedger, BxReimburseApply
+from app.services.bx.list_sort import (
+    order_advance,
+    order_invoice,
+    order_ledger,
+    order_reimburse,
+    parse_sort_params,
+)
+
+
+def test_advance_apply_time_asc():
+    expr = order_advance("applyTime", "asc")
+    assert "create_time" in str(expr).lower()
+    assert "asc" in str(expr).lower()
+
+
+def test_advance_issue_time():
+    expr = order_advance("issueTime", "desc")
+    assert "issue_time" in str(expr).lower()
+
+
+def test_advance_invalid_falls_back():
+    default = BxAdvanceApply.create_time.desc()
+    assert order_advance("hack", "asc", default=default) is default
+
+
+def test_reimburse_pay_time():
+    expr = order_reimburse("payTime", "desc")
+    assert "pay_time" in str(expr).lower()
+
+
+def test_invoice_create_time():
+    expr = order_invoice("createTime", "asc")
+    assert "create_time" in str(expr).lower()
+
+
+def test_ledger_create_time():
+    expr = order_ledger("createTime", "desc")
+    assert "create_time" in str(expr).lower()
+
+
+def test_parse_sort_params_camel():
+    sf, so = parse_sort_params({"sortField": "applyTime", "sortOrder": "asc"})
+    assert sf == "applyTime"
+    assert so == "asc"
+
+
+def test_parse_sort_params_snake():
+    sf, so = parse_sort_params({"sort_field": "payTime", "sort_order": "desc"})
+    assert sf == "payTime"
+    assert so == "desc"