diff --git a/backend/app/api/maps.py b/backend/app/api/maps.py
index 1ee4f19c..2f62d784 100644
--- a/backend/app/api/maps.py
+++ b/backend/app/api/maps.py
@@ -308,7 +308,18 @@ def _merge_map_objectives(m, db):
     for dim in dims:
         key = dim.get("key", "")
         if key in grouped:
-            dim["objectives"] = [{"name": o.name, "description": o.description or "", "icon": o.icon or "target", "kpis": o.kpis or []} for o in grouped[key]]
+            merged = []
+            for i, o in enumerate(grouped[key]):
+                # 保留原有JSON中的额外字段（targetValue/krs等）
+                existing = dim["objectives"][i] if i < len(dim["objectives"]) else {}
+                merged.append({
+                    "name": o.name,
+                    "description": o.description or existing.get("description", ""),
+                    "icon": o.icon or existing.get("icon", "target"),
+                    "kpis": o.kpis or existing.get("kpis", []),
+                    **{k: existing[k] for k in existing if k not in ("name", "description", "icon", "kpis")},
+                })
+            dim["objectives"] = merged
     m.dimensions = dims