diff --git a/strategy_lab.py b/strategy_lab.py
index 8bb6e1e9..b8772d9f 100644
--- a/strategy_lab.py
+++ b/strategy_lab.py
@@ -1055,7 +1055,7 @@ def max_concurrency(trades):
     return max(peak, 1)
 
 
-MIN_POSITION = 50000  # 单仓可行性下限（A股一手+手续费，约5万）
+MIN_POSITION = 25000  # 单仓可行性下限（A股中低价票2.5万可覆盖；高价票除外，2026-07-29老爸：让v8.1类低信号策略尽量全执行）
 
 def portfolio_sim_full(trades, capital=1000000, runs=50):
     """全参与组合模拟（Monte Carlo 随机选装版）：