diff --git a/.env.example b/.env.example
index 62491de..66fb334 100644
--- a/.env.example
+++ b/.env.example
@@ -15,6 +15,9 @@ TRAILING_PROFIT=0.2                     # Trailing stop activation profit (USDT)
 TRAILING_CALLBACK_RATE=0.2              # Trailing callback percent (e.g. 0.2 => 0.2%)
 PROFIT_LOCK_TRIGGER_USD=0.1             # Start moving base stop once unrealized PnL > this (USDT)
 PROFIT_LOCK_OFFSET_USD=0.05             # Base stop offset from entry after trigger (USDT)
+BOLLINGER_LENGTH=20                     # SMA window (minutes) used for Bollinger bandwidth
+BOLLINGER_STD_MULTIPLIER=2              # Standard deviation multiplier for Bollinger bands
+MIN_BOLLINGER_BANDWIDTH=0.1             # Require bandwidth >= this ratio before new entries
 
 # Precision (per-symbol exchange filters)
 PRICE_TICK=0.1                          # Price tick size (e.g. BTCUSDT uses 0.1)
diff --git a/README.md b/README.md
index 92c7b3d..7db8fef 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,7 @@ Windows 使用 WSL（推荐）：
    - `LOSS_LIMIT`：单笔允许的最大亏损（USDT），触发即强制平仓。
    - `TRAILING_PROFIT` / `TRAILING_CALLBACK_RATE`：趋势策略的动态止盈触发值（单位 USDT）与回撤百分比（百分数，如 0.2 表示 0.2%）。
    - `PROFIT_LOCK_TRIGGER_USD` / `PROFIT_LOCK_OFFSET_USD`：达到一定浮盈后，将基础止损上调（做多）或下调（做空）到开仓价的偏移量（单位 USDT）。
+   - `BOLLINGER_LENGTH` / `BOLLINGER_STD_MULTIPLIER` / `MIN_BOLLINGER_BANDWIDTH`：布林带宽度过滤参数，默认使用 20 根 1 分钟 K 线及 2 倍标准差，仅当带宽比例 ≥ 0.1 时允许入场。
    - `PRICE_TICK` / `QTY_STEP`：交易对的最小价格变动单位与最小下单数量步长（例如 BTCUSDT 分别为 0.1 与 0.001）。
    - `MAKER_*` 参数：做市策略追价阈值、报价偏移、刷新频率等，可按流动性需求调节。
 6. **运行机器人**
diff --git a/src/config.ts b/src/config.ts
index a0e1a66..423cf70 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -12,6 +12,9 @@ export interface TradingConfig {
   maxCloseSlippagePct: number;
   priceTick: number; // price tick size, e.g. 0.1 for BTCUSDT
   qtyStep: number;   // quantity step size, e.g. 0.001 BTC
+  bollingerLength: number;
+  bollingerStdMultiplier: number;
+  minBollingerBandwidth: number;
 }
 
 function parseNumber(value: string | undefined, fallback: number): number {
@@ -34,6 +37,9 @@ export const tradingConfig: TradingConfig = {
   maxCloseSlippagePct: parseNumber(process.env.MAX_CLOSE_SLIPPAGE_PCT, 0.05),
   priceTick: parseNumber(process.env.PRICE_TICK, 0.1),
   qtyStep: parseNumber(process.env.QTY_STEP, 0.001),
+  bollingerLength: parseNumber(process.env.BOLLINGER_LENGTH, 20),
+  bollingerStdMultiplier: parseNumber(process.env.BOLLINGER_STD_MULTIPLIER, 2),
+  minBollingerBandwidth: parseNumber(process.env.MIN_BOLLINGER_BANDWIDTH, 0.1),
 };
 
 export interface MakerConfig {
diff --git a/src/core/trend-engine.ts b/src/core/trend-engine.ts
index 5cbaec7..aa14362 100644
--- a/src/core/trend-engine.ts
+++ b/src/core/trend-engine.ts
@@ -11,6 +11,7 @@ import type {
 import {
   calcStopLossPrice,
   calcTrailingActivationPrice,
+  computeBollingerBandwidth,
   getPosition,
   getSMA,
   type PositionSnapshot,
@@ -37,6 +38,7 @@ export interface TrendEngineSnapshot {
   symbol: string;
   lastPrice: number | null;
   sma30: number | null;
+  bollingerBandwidth: number | null;
   trend: "做多" | "做空" | "无信号";
   position: PositionSnapshot;
   pnl: number;
@@ -78,6 +80,7 @@ export class TrendEngine {
   private processing = false;
   private lastPrice: number | null = null;
   private lastSma30: number | null = null;
+  private lastBollingerBandwidth: number | null = null;
   private totalProfit = 0;
   private totalTrades = 0;
   private lastOpenPlan: OpenOrderPlan = { side: null, price: null };
@@ -99,6 +102,7 @@ export class TrendEngine {
   private lastEntryMinute: number | null = null;
   // 止损后冷却：止损发生后的 60s 内忽略 SMA 入场信号
   private lastStopLossAt: number | null = null;
+  private lastBollingerBlockLogged = 0;
 
   private ordersSnapshotReady = false;
   private startupLogged = false;
@@ -243,11 +247,12 @@ export class TrendEngine {
   }
 
   private isReady(): boolean {
+    const minKlines = Math.max(30, this.config.bollingerLength);
     return Boolean(
       this.accountSnapshot &&
         this.tickerSnapshot &&
         this.depthSnapshot &&
-        this.klineSnapshot.length >= 30
+        this.klineSnapshot.length >= minKlines
     );
   }
 
@@ -277,13 +282,19 @@ export class TrendEngine {
       if (sma30 == null) {
         return;
       }
+      const bollingerBandwidth = computeBollingerBandwidth(
+        this.klineSnapshot,
+        this.config.bollingerLength,
+        this.config.bollingerStdMultiplier
+      );
+      this.lastBollingerBandwidth = bollingerBandwidth;
       const ticker = this.tickerSnapshot!;
       const price = Number(ticker.lastPrice);
       const position = getPosition(this.accountSnapshot, this.config.symbol);
 
       if (Math.abs(position.positionAmt) < 1e-5) {
         if (!this.rateLimit.shouldBlockEntries()) {
-          await this.handleOpenPosition(price, sma30);
+          await this.handleOpenPosition(price, sma30, bollingerBandwidth);
         }
       } else {
         const result = await this.handlePositionManagement(position, price);
@@ -345,7 +356,11 @@ export class TrendEngine {
     this.startupLogged = true;
   }
 
-  private async handleOpenPosition(currentPrice: number, currentSma: number): Promise<void> {
+  private async handleOpenPosition(
+    currentPrice: number,
+    currentSma: number,
+    currentBandwidth: number | null
+  ): Promise<void> {
     this.entryPricePendingLogged = false;
     const now = Date.now();
     const currentMinute = Math.floor(now / 60_000);
@@ -360,6 +375,20 @@ export class TrendEngine {
       this.tradeLog.push("info", "本分钟已入场，忽略新的 SMA 入场信号");
       return;
     }
+    if (
+      Number.isFinite(currentBandwidth) &&
+      this.config.minBollingerBandwidth > 0 &&
+      Number(currentBandwidth) < this.config.minBollingerBandwidth
+    ) {
+      if (now - this.lastBollingerBlockLogged > 15_000) {
+        this.tradeLog.push(
+          "info",
+          `布林带宽度不足：${Number(currentBandwidth).toFixed(4)} < ${this.config.minBollingerBandwidth}，忽略入场信号`
+        );
+        this.lastBollingerBlockLogged = now;
+      }
+      return;
+    }
     if (this.lastPrice == null) {
       this.lastPrice = currentPrice;
       return;
@@ -852,6 +881,7 @@ export class TrendEngine {
       symbol: this.config.symbol,
       lastPrice: price,
       sma30,
+      bollingerBandwidth: this.lastBollingerBandwidth,
       trend,
       position,
       pnl,
diff --git a/src/utils/strategy.ts b/src/utils/strategy.ts
index 8623bc3..77ea045 100644
--- a/src/utils/strategy.ts
+++ b/src/utils/strategy.ts
@@ -52,6 +52,37 @@ export function calcTrailingActivationPrice(entryPrice: number, qty: number, sid
   return entryPrice - profit / Math.abs(qty);
 }
 
+export function computeBollingerBandwidth(
+  values: AsterKline[],
+  length: number,
+  stdMultiplier: number
+): number | null {
+  const period = Number.isInteger(length) ? Number(length) : 0;
+  const multiplier = Number.isFinite(stdMultiplier) ? stdMultiplier : 0;
+  if (!Array.isArray(values) || period <= 0 || values.length < period || multiplier <= 0) {
+    return null;
+  }
+  const window = values.slice(-period);
+  const closes = window.map((kline) => Number(kline.close));
+  if (closes.some((close) => !Number.isFinite(close))) {
+    return null;
+  }
+  const mean = closes.reduce((sum, price) => sum + price, 0) / period;
+  if (!Number.isFinite(mean) || mean <= 0) {
+    return null;
+  }
+  const variance = closes.reduce((sum, price) => {
+    const diff = price - mean;
+    return sum + diff * diff;
+  }, 0) / period;
+  const std = Math.sqrt(Math.max(variance, 0));
+  const width = std * multiplier * 2;
+  if (!Number.isFinite(width)) {
+    return null;
+  }
+  return width / mean;
+}
+
 /**
  * Return true if the intended order price is within the allowed deviation from mark price.
  * - For BUY: orderPrice must be <= markPrice * (1 + maxPct)
diff --git a/tests/strategy-utils.test.ts b/tests/strategy-utils.test.ts
index 7f94914..eda560b 100644
--- a/tests/strategy-utils.test.ts
+++ b/tests/strategy-utils.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { getPosition, getSMA } from "../src/utils/strategy";
+import { computeBollingerBandwidth, getPosition, getSMA } from "../src/utils/strategy";
 import type { AsterAccountSnapshot, AsterKline } from "../src/exchanges/types";
 
 const mockSnapshot = (positions: Array<{ symbol: string; amt: number; entry: number; pnl: number }> = []): AsterAccountSnapshot => ({
@@ -55,4 +55,17 @@ describe("strategy utils", () => {
     const data = mockKlines(Array.from({ length: 30 }, (_, i) => i + 1));
     expect(getSMA(data, 30)).toBe(15.5);
   });
+
+  it("returns null Bollinger bandwidth when data insufficient", () => {
+    const klines = mockKlines([100, 101, 102]);
+    expect(computeBollingerBandwidth(klines, 20, 2)).toBeNull();
+  });
+
+  it("computes Bollinger bandwidth ratio", () => {
+    const closes = [...Array(19).fill(100), 110];
+    const klines = mockKlines(closes);
+    const bandwidth = computeBollingerBandwidth(klines, 20, 2);
+    expect(bandwidth).not.toBeNull();
+    expect(bandwidth ?? 0).toBeCloseTo(0.0867443, 5);
+  });
 });