diff --git a/scripts/data_platform/fundamentals_dmsk_download.py b/scripts/data_platform/fundamentals_dmsk_download.py
index f08f5ae..c2e6a3d 100644
--- a/scripts/data_platform/fundamentals_dmsk_download.py
+++ b/scripts/data_platform/fundamentals_dmsk_download.py
@@ -388,7 +388,10 @@ def fetch_period_rows(client, domain, report_date):
     while True:
         params = {
             "sortColumns": "SECURITY_CODE", "sortTypes": "1",
-            "pageSize": str(DC_PAGE_SIZE), "pageNum": str(page),
+            "pageSize": str(DC_PAGE_SIZE),
+            "pageNumber": str(page),   # 东财 datacenter 用 pageNumber(cninfo
+                                       # 才是 pageNum; 写错被静默忽略=翻页
+                                       # 失效, 每页都回第一页, 冒烟 12 页同 500 行实锤)
             "reportName": DOMAINS[domain], "columns": "ALL",
             "filter": f"(REPORT_DATE='{report_date}')",
         }
diff --git a/tests/data_platform/test_fundamentals_dmsk_download.py b/tests/data_platform/test_fundamentals_dmsk_download.py
index 171c958..7b3c6f2 100644
--- a/tests/data_platform/test_fundamentals_dmsk_download.py
+++ b/tests/data_platform/test_fundamentals_dmsk_download.py
@@ -99,7 +99,7 @@ def test_fetch_period_rows_paginates_to_pages_end(root, monkeypatch):
 
     def fake_request(method, url, **kw):
         calls.append(kw["params"])
-        page = int(kw["params"]["pageNum"])
+        page = int(kw["params"]["pageNumber"])
         return FakeResp({"result": {"pages": 3, "count": 6, "data": [
             _raw(code=f"60000{page}")] * 2}, "success": True})