diff --git a/backend/app/crud/cell_product.py b/backend/app/crud/cell_product.py
index bb5a3d52..3006b4e6 100644
--- a/backend/app/crud/cell_product.py
+++ b/backend/app/crud/cell_product.py
@@ -1410,6 +1410,62 @@ def _build_descendant_chain(
     return result
 
 
+def _lineage_node_key(node: Dict[str, Any]) -> str:
+    nt = (node.get("nodeType") or "").strip()
+    nid = (node.get("id") or "").strip()
+    if nt == "sample":
+        code = (node.get("sampleCode") or "").strip()
+        return f"sample:{(nid or code)}"
+    return f"{nt}:{nid}"
+
+
+def _walk_ancestor_link(
+    link: Any,
+    out: List[Dict[str, Any]],
+    seen: set,
+) -> None:
+    if not link:
+        return
+    if isinstance(link, list):
+        for item in link:
+            _walk_ancestor_link(item, out, seen)
+        return
+    if not isinstance(link, dict):
+        return
+    parent = link.get("parent")
+    _walk_ancestor_link(parent, out, seen)
+    node = link.get("node")
+    if not isinstance(node, dict):
+        return
+    key = _lineage_node_key(node)
+    if not key or key in seen:
+        return
+    seen.add(key)
+    out.append(dict(node))
+
+
+def _flatten_lineage_nodes(chain: Dict[str, Any]) -> List[Dict[str, Any]]:
+    """将 get_product_chain 结果展平为上游→下游节点列表（含 current，不含 descendants）。"""
+    out: List[Dict[str, Any]] = []
+    seen: set = set()
+    for link in chain.get("ancestors") or []:
+        _walk_ancestor_link(link, out, seen)
+    current = chain.get("current")
+    if isinstance(current, dict):
+        key = _lineage_node_key(current)
+        if key and key not in seen:
+            seen.add(key)
+            node = dict(current)
+            node["isCurrent"] = True
+            out.append(node)
+        elif key:
+            for n in out:
+                if _lineage_node_key(n) == key:
+                    n["isCurrent"] = True
+                    break
+    return out
+
+
 def get_product_chain(db: Session, product_id: str, tenant_no: str) -> Optional[Dict[str, Any]]:
     product = get_cell_product(db, product_id, tenant_no)
     if not product:
diff --git a/backend/tests/test_cell_product_lineage_qc.py b/backend/tests/test_cell_product_lineage_qc.py
new file mode 100644
index 00000000..cd8a883f
--- /dev/null
+++ b/backend/tests/test_cell_product_lineage_qc.py
@@ -0,0 +1,134 @@
+"""细胞产品来源链质检 — 节点展平与编排"""
+import unittest
+from unittest.mock import MagicMock, patch
+
+from app.crud.cell_product import _flatten_lineage_nodes
+
+
+class TestFlattenLineageNodes(unittest.TestCase):
+    def test_current_only_when_no_ancestors(self):
+        chain = {
+            "current": {
+                "id": "cp-cur",
+                "productCode": "C-CUR",
+                "productName": "当前",
+                "nodeType": "cell_product",
+                "passage": "P2",
+                "isCurrent": True,
+            },
+            "ancestors": [],
+        }
+        nodes = _flatten_lineage_nodes(chain)
+        self.assertEqual(len(nodes), 1)
+        self.assertEqual(nodes[0]["id"], "cp-cur")
+        self.assertTrue(nodes[0]["isCurrent"])
+
+    def test_sample_then_parent_then_current_order(self):
+        sample = {
+            "id": "s1",
+            "nodeType": "sample",
+            "sampleCode": "YB001",
+            "receptionSource": "cell_storage",
+            "receptionSourceLabel": "细胞存储",
+        }
+        parent = {
+            "id": "cp-p1",
+            "productCode": "C-P1",
+            "productName": "父代",
+            "nodeType": "cell_product",
+            "passage": "P1",
+            "isCurrent": False,
+        }
+        current = {
+            "id": "cp-cur",
+            "productCode": "C-CUR",
+            "productName": "当前",
+            "nodeType": "cell_product",
+            "passage": "P2",
+            "isCurrent": True,
+        }
+        chain = {
+            "current": current,
+            "ancestors": [
+                {
+                    "node": parent,
+                    "edge": {},
+                    "parent": {"node": sample, "edge": {}, "parent": None},
+                }
+            ],
+        }
+        nodes = _flatten_lineage_nodes(chain)
+        self.assertEqual([n["id"] for n in nodes], ["s1", "cp-p1", "cp-cur"])
+        self.assertEqual(nodes[0]["nodeType"], "sample")
+        self.assertTrue(nodes[-1]["isCurrent"])
+
+    def test_dedupe_same_node_type_and_id(self):
+        parent = {
+            "id": "cp-p1",
+            "nodeType": "cell_product",
+            "productCode": "C-P1",
+            "productName": "父",
+            "passage": "P1",
+            "isCurrent": False,
+        }
+        current = {
+            "id": "cp-cur",
+            "nodeType": "cell_product",
+            "productCode": "C-CUR",
+            "productName": "当前",
+            "passage": "P2",
+            "isCurrent": True,
+        }
+        chain = {
+            "current": current,
+            "ancestors": [
+                {"node": parent, "edge": {}, "parent": None},
+                {"node": dict(parent), "edge": {}, "parent": None},
+            ],
+        }
+        nodes = _flatten_lineage_nodes(chain)
+        ids = [n["id"] for n in nodes]
+        self.assertEqual(ids.count("cp-p1"), 1)
+        self.assertEqual(ids[-1], "cp-cur")
+
+    def test_parent_array_multi_input(self):
+        s1 = {"id": "s1", "nodeType": "sample", "sampleCode": "A", "receptionSource": "cell_storage"}
+        s2 = {"id": "s2", "nodeType": "sample", "sampleCode": "B", "receptionSource": "cell_storage"}
+        parent = {
+            "id": "cp-p1",
+            "nodeType": "cell_product",
+            "productCode": "P1",
+            "productName": "父",
+            "passage": "P1",
+            "isCurrent": False,
+        }
+        current = {
+            "id": "cp-cur",
+            "nodeType": "cell_product",
+            "productCode": "CUR",
+            "productName": "当前",
+            "passage": "P2",
+            "isCurrent": True,
+        }
+        chain = {
+            "current": current,
+            "ancestors": [
+                {
+                    "node": parent,
+                    "edge": {},
+                    "parent": [
+                        {"node": s1, "edge": {}, "parent": None},
+                        {"node": s2, "edge": {}, "parent": None},
+                    ],
+                }
+            ],
+        }
+        nodes = _flatten_lineage_nodes(chain)
+        ids = [n["id"] for n in nodes]
+        self.assertIn("s1", ids)
+        self.assertIn("s2", ids)
+        self.assertEqual(ids[-1], "cp-cur")
+
+
+if __name__ == "__main__":
+    unittest.main()