diff --git a/prompts/adaptive.txt b/prompts/adaptive.txt
index 4f0e0067..20eb03df 100644
--- a/prompts/adaptive.txt
+++ b/prompts/adaptive.txt
@@ -139,6 +139,24 @@
 - `partial_close` 用于锁定阶段性收益或降低风险，建议使用清晰比例（如 25% / 50% / 75%），并说明目的（例："锁定关键阻力前利润""减半仓等待回踩确认"）。
 - 执行部分平仓后，应评估是否需要同步上调止损 / 下调止盈，确保剩余仓位符合新的风险回报结构。
 - `update_stop_loss` / `update_take_profit` 优先用于顺势推进（如跟踪新高新低），避免在无新证据下放宽止损。
+
+## ⚠️ 止损方向逻辑（关键规则）
+
+**多单 (Long Position):**
+- 止损价格必须 **低于** 入场价格（`stop_loss < entry_price`）
+- 原因：保护下跌风险，价格跌破止损时自动平仓
+- 示例：入场 $100，止损 $95（亏损 5%）
+
+**空单 (Short Position):**
+- 止损价格必须 **高于** 入场价格（`stop_loss > entry_price`）
+- 原因：保护上涨风险，价格涨破止损时自动平仓
+- 示例：入场 $100，止损 $105（亏损 5%）
+
+**常见错误（务必避免）：**
+- ❌ 空单设置 `stop_loss < entry_price`（错误！会导致验证失败）
+- ❌ 多单设置 `stop_loss > entry_price`（错误！会导致无保护）
+- ✅ 使用 `update_stop_loss` 调整时，同样遵循上述方向规则
+
 - 若计划分批退出，请在 `reasoning` 中描述剩余仓位的策略与失效条件，避免出现"减仓后不知道如何处理剩余部位"的情况。
 
 ---
diff --git a/prompts/nof1.txt b/prompts/nof1.txt
index 055fdb84..921aa080 100644
--- a/prompts/nof1.txt
+++ b/prompts/nof1.txt
@@ -72,6 +72,31 @@ You can issue the following actions each decision cycle:
   - ✅ Locking in profits as position moves in your favor
   - ❌ NOT for widening stops without new evidence (don't move stops against you)
 
+## ⚠️ Stop-Loss Direction Logic (Critical Rule)
+
+**Long Position:**
+- Stop-loss MUST be **below** entry price (`stop_loss < entry_price`)
+- Reason: Protects against downside risk, exits when price drops below threshold
+- Example: Entry $100, stop-loss $95 (5% loss protection)
+
+**Short Position:**
+- Stop-loss MUST be **above** entry price (`stop_loss > entry_price`)
+- Reason: Protects against upside risk, exits when price rises above threshold
+- Example: Entry $100, stop-loss $105 (5% loss protection)
+
+**Common Mistakes (Must Avoid):**
+- ❌ Short position with `stop_loss < entry_price` (WRONG! Causes validation failure)
+- ❌ Long position with `stop_loss > entry_price` (WRONG! No protection)
+- ✅ When using `update_stop_loss`, follow the same directional rules above
+
+**Real Example from Error Log:**
+```
+Position: SHORT BTCUSDT at $108,230
+AI attempted: stop_loss = $107,500 (WRONG! Below entry)
+Correct: stop_loss should be > $108,230 (e.g., $109,000)
+Error: "空单止损必须高于当前价格"
+```
+
 ## Multi-Stage Exit Strategy
 
 When planning phased exits (partial closes):