diff --git a/crypto_monitor_okx/app.py b/crypto_monitor_okx/app.py
index 708f89d..cd93061 100644
--- a/crypto_monitor_okx/app.py
+++ b/crypto_monitor_okx/app.py
@@ -6793,6 +6793,7 @@ def render_main_page(page="trade", embed_mode=None):
         in ("1", "true", "yes", "on"),
         hedge_plan_budget_buffer=float(os.getenv("HEDGE_PLAN_BUDGET_BUFFER") or "0.95"),
         options_trade_budget=OKX_OPTIONS_TRADE_BUDGET_USDC,
+        options_budget_buffer=float(os.getenv("OKX_OPTIONS_BUDGET_BUFFER") or "0.95"),
         options_default_underly=OKX_OPTIONS_DEFAULT_UNDERLY,
         options_chain_ask_liq_filter=os.getenv(
             "OKX_OPTIONS_CHAIN_ASK_LIQ_FILTER_ENABLED", "true"
diff --git a/lib/common/static/options_panel.js b/lib/common/static/options_panel.js
index 2b408f2..d9ff3c9 100644
--- a/lib/common/static/options_panel.js
+++ b/lib/common/static/options_panel.js
@@ -16,6 +16,11 @@
     strikeExpandAll: false,
     /** 环境 OKX_OPTIONS_CHAIN_ASK_LIQ_FILTER_ENABLED;链接口可热更新 */
     askLiqFilter: root.dataset.askLiqFilter !== "0",
+    budgetBuffer: (function () {
+      const raw = root.dataset.budgetBuffer;
+      const n = raw != null && raw !== "" ? Number(raw) : NaN;
+      return !Number.isNaN(n) && n > 0 ? n : 0.95;
+    })(),
     chain: panelCache.chain || null,
     selectedInst: null,
     orderQuote: null,
@@ -568,6 +573,15 @@
     }
   }
 
+  function applyBudgetBuffer(raw) {
+    if (raw == null || raw === "") return;
+    const buf = Number(raw);
+    if (Number.isNaN(buf) || buf <= 0) return;
+    state.budgetBuffer = buf;
+    const el = document.getElementById("opt-budget-buf");
+    if (el) el.textContent = fmt(buf, 2);
+  }
+
   function renderIndexLine() {
     const idx = state.chain && state.chain.index_px;
     const dte = state.chain && state.chain.chain_max_dte_days;
@@ -575,6 +589,9 @@
       const el = document.getElementById("opt-chain-dte");
       if (el) el.textContent = String(Math.round(dte));
     }
+    if (state.chain && state.chain.budget_buffer != null) {
+      applyBudgetBuffer(state.chain.budget_buffer);
+    }
     const line = document.getElementById("opt-index-line");
     if (line) {
       const liqHint = askLiqFilterOn() ? "仅显示卖一深度≥1张" : "显示全部卖一(含估算~)";
@@ -2055,6 +2072,7 @@
   }
 
   function bootOptionsPanel() {
+    applyBudgetBuffer(state.budgetBuffer);
     updateSizeInputs();
     syncMoneyFilterButtons();
     syncChainViewUI();
diff --git a/lib/options/options_register.py b/lib/options/options_register.py
index 5d196f7..eb7e163 100644
--- a/lib/options/options_register.py
+++ b/lib/options/options_register.py
@@ -373,6 +373,7 @@ def register_options_routes(app: Flask, cfg: dict[str, Any]) -> None:
         chain_err = chain.get("chain_error")
         # 热更新:每次读 env,保存配置后刷新链即可生效
         ask_liq_filter = _env_bool("OKX_OPTIONS_CHAIN_ASK_LIQ_FILTER_ENABLED", True)
+        budget_buffer = _env_float("OKX_OPTIONS_BUDGET_BUFFER", 0.95)
         if not expiries:
             return jsonify(
                 {
@@ -381,6 +382,8 @@ def register_options_routes(app: Flask, cfg: dict[str, Any]) -> None:
                     **chain,
                     "chain_max_dte_days": cfg["chain_max_dte_days"],
                     "ask_liq_filter_enabled": ask_liq_filter,
+                    "budget_buffer": budget_buffer,
+                    "trade_budget": cfg["trade_budget"],
                 }
             )
         return jsonify(
@@ -389,6 +392,8 @@ def register_options_routes(app: Flask, cfg: dict[str, Any]) -> None:
                 **chain,
                 "chain_max_dte_days": cfg["chain_max_dte_days"],
                 "ask_liq_filter_enabled": ask_liq_filter,
+                "budget_buffer": budget_buffer,
+                "trade_budget": cfg["trade_budget"],
             }
         )
 
diff --git a/lib/options/templates/options_panel.html b/lib/options/templates/options_panel.html
index 84e6da3..2cf1ffb 100644
--- a/lib/options/templates/options_panel.html
+++ b/lib/options/templates/options_panel.html
@@ -1,5 +1,6 @@
 <div class="options-page-wrap" style="grid-column:1/-1" id="options-root"
      data-default-underly="{{ options_default_underly | default('ETH') }}"
+     data-budget-buffer="{{ options_budget_buffer | default(0.95) }}"
      data-ask-liq-filter="{% if options_chain_ask_liq_filter is defined %}{{ '1' if options_chain_ask_liq_filter else '0' }}{% else %}1{% endif %}">
     {% if not options_enabled %}
     <div class="flash" style="margin-bottom:12px">期权 API 未启用:请在 <code>crypto_monitor_okx/.env</code> 设置 <code>OKX_OPTIONS_ENABLED=true</code> 及主账户 <code>OKX_OPTIONS_API_*</code>,然后 <code>pm2 restart crypto_okx --update-env</code>.</div>
@@ -17,6 +18,7 @@
                         <li>环境配置「链上仅显示有卖一」开启时,隐藏无真实卖一或深度不足 1 张的合约(估算价 <strong>~</strong> 亦不显示)。</li>
                         <li><strong>开仓只认真实卖一价且卖一深度≥1</strong>;无深度时面板显示参考标记价并禁用买入。</li>
                         <li>链展示近 <span id="opt-chain-dte">14</span> 日到期;<strong>T 型</strong>默认 ATM ±5 档,可展开全部。</li>
+                        <li>「按可用余额打满」可用额度 = min(交易 USDC × 预算缓冲 <strong id="opt-budget-buf">{{ '%.2f'|format(options_budget_buffer|default(0.95)|float) }}</strong>, 单笔预算);可在 env「预算缓冲比例」改。</li>
                         <li>平仓仅买一限价,详见说明文档。</li>
                     </ul>
                     <p><a href="/options/guide" target="_blank" rel="noopener">打开《期权开平仓与监控说明》</a></p>
@@ -314,4 +316,4 @@
     </div>
 </div>
 <script src="/static/options_expiry_countdown.js?v=1"></script>
-<script src="/static/options_panel.js?v=48"></script>
+<script src="/static/options_panel.js?v=49"></script>