diff --git a/server.py b/server.py
index 27d2a008..5ff277c0 100644
--- a/server.py
+++ b/server.py
@@ -569,6 +569,28 @@ def api_research_strategies():
             s['regime_winrates'] = _regime_winrates.get(s['version'], {})
             # current = 当前温区激活（替代旧的 CURRENT_VERSIONS 硬编码）
             s['current'] = s['version'] in _active_set
+
+        # 2026-08-13 关键修复：激活策略必须始终在列表中（即使该 period 无回测记录）
+        # 否则 2y 等默认周期下激活策略缺失（只显示 v_oversold）。
+        # 缺失的激活策略用 10y 数据补全 summary_stats + regime_winrates。
+        _existing = {s['version'] for s in strats}
+        _missing_active = sorted(_active_set - _existing)
+        if _missing_active:
+            try:
+                _s10 = list_strategies(period_tag='10y')
+                _by10 = {s['version']: s for s in _s10}
+            except Exception:
+                _by10 = {}
+            for _mv in _missing_active:
+                _s10 = _by10.get(_mv)
+                if not _s10:
+                    continue
+                _entry = dict(_s10)
+                _entry['description'] = STRATEGY_DESCRIPTIONS.get(_mv, {})
+                _entry['regime_winrates'] = _regime_winrates.get(_mv, {})
+                _entry['current'] = True
+                _entry['note'] = f"({pt or '当前周期'}无回测记录，显示10y数据)"
+                strats.append(_entry)
         return jsonify({'strategies': strats, 'regime_active': sorted(_active_set)})
     except Exception as e:
         return jsonify({'error': str(e)}), 500