diff --git a/lib/common/static/options_panel.js b/lib/common/static/options_panel.js
index 75422dc..0cbecf0 100644
--- a/lib/common/static/options_panel.js
+++ b/lib/common/static/options_panel.js
@@ -26,6 +26,7 @@
   let lastGoodPositions = null;
   let lastGoodPositionsAt = 0;
   let positionsRefreshSeq = 0;
+  let chainLoadSeq = 0;
   let refreshAllTimer = null;
   let pendingRefreshTimer = null;
   let pendingTtlSeconds = 600;
@@ -484,8 +485,8 @@
     const sel = document.getElementById("opt-exp-select");
     if (!sel) return;
     const prev = preserveSelection !== false ? sel.value : "";
-    sel.innerHTML = '<option value="">选择到期日</option>';
     const exps = (state.chain && state.chain.expiries) || [];
+    sel.innerHTML = '<option value="">选择到期日</option>';
     exps.forEach(function (e) {
       const o = document.createElement("option");
       o.value = String(e.exp_time);
@@ -497,6 +498,20 @@
     }
   }
 
+  function setExpirySelectStatus(text) {
+    const sel = document.getElementById("opt-exp-select");
+    if (!sel) return;
+    sel.innerHTML = "";
+    const o = document.createElement("option");
+    o.value = "";
+    o.textContent = text || "选择到期日";
+    sel.appendChild(o);
+  }
+
+  function chainHasExpiries(chain) {
+    return !!(chain && Array.isArray(chain.expiries) && chain.expiries.length > 0);
+  }
+
   function renderExpiries() {
     renderExpiryOptions(true);
     renderIndexLine();
@@ -938,25 +953,93 @@
     }
   }
 
-  async function loadChain() {
-    const d = await apiJson("/api/options/chain?underlying=" + encodeURIComponent(state.underlying));
-    if (!d.ok) {
-      alert(d.msg || "加载失败");
-      return;
+  async function loadChain(opts) {
+    const soft = !!(opts && opts.soft);
+    const uly = state.underlying;
+    const seq = ++chainLoadSeq;
+    const btn = document.getElementById("opt-load-chain");
+    if (btn && !soft) btn.disabled = true;
+    if (!soft) {
+      setExpirySelectStatus("加载到期日中…");
+      const tbody = document.getElementById("opt-strike-tbody");
+      if (tbody) {
+        tbody.innerHTML =
+          '<tr><td colspan="' + strikeTableColspan() + '" class="muted">加载期权链…</td></tr>';
+      }
+    }
+    try {
+      let d = null;
+      let lastMsg = "";
+      for (let attempt = 0; attempt < 2; attempt++) {
+        if (seq !== chainLoadSeq) return;
+        d = await apiJson("/api/options/chain?underlying=" + encodeURIComponent(uly));
+        if (seq !== chainLoadSeq) return;
+        if (d && d.ok && chainHasExpiries(d)) break;
+        lastMsg = (d && (d.msg || d.chain_error)) || "暂无到期日";
+        d = null;
+        if (attempt === 0) {
+          if (!soft) setExpirySelectStatus("重试加载到期日…");
+          await new Promise(function (resolve) { setTimeout(resolve, 400); });
+        }
+      }
+      if (seq !== chainLoadSeq) return;
+      if (!d || !d.ok || !chainHasExpiries(d)) {
+        if (chainHasExpiries(state.chain) && state.chain.underlying === uly) {
+          if (!soft) {
+            renderExpiries();
+            renderStrikes();
+          }
+          return;
+        }
+        if (soft) return;
+        setExpirySelectStatus("选择到期日");
+        const tbody = document.getElementById("opt-strike-tbody");
+        if (tbody) {
+          tbody.innerHTML =
+            '<tr><td colspan="' + strikeTableColspan() + '" class="muted">' +
+            (lastMsg || "暂无到期日,请点「刷新链」") +
+            "</td></tr>";
+        }
+        alert(lastMsg || "加载到期日失败,请点「刷新链」重试");
+        return;
+      }
+      const keepSel = soft && state.selectedInst;
+      const keepExp = soft ? (document.getElementById("opt-exp-select") || {}).value : "";
+      state.chain = d;
+      panelCache.chain = d;
+      panelCache.underlying = uly;
+      panelCache.optType = state.optType;
+      if (!soft) {
+        state.selectedInst = null;
+        resetMoneyFilterToAll();
+        state.strikeExpandAll = false;
+        const expandCb = document.getElementById("opt-strike-expand-all");
+        if (expandCb) expandCb.checked = false;
+        parkOrderPanel();
+      }
+      updateUnderlyingLabel();
+      renderExpiries();
+      if (soft && keepExp) {
+        const sel = document.getElementById("opt-exp-select");
+        if (sel && Array.from(sel.options).some(function (o) { return o.value === keepExp; })) {
+          sel.value = keepExp;
+        }
+      }
+      renderStrikes();
+      if (soft && keepSel) state.selectedInst = keepSel;
+    } catch (e) {
+      if (seq !== chainLoadSeq || soft) return;
+      setExpirySelectStatus("选择到期日");
+      const tbody = document.getElementById("opt-strike-tbody");
+      if (tbody) {
+        tbody.innerHTML =
+          '<tr><td colspan="' + strikeTableColspan() + '" class="muted">加载失败: ' +
+          String((e && e.message) || e) +
+          "</td></tr>";
+      }
+    } finally {
+      if (seq === chainLoadSeq && btn) btn.disabled = false;
     }
-    state.chain = d;
-    panelCache.chain = d;
-    panelCache.underlying = state.underlying;
-    panelCache.optType = state.optType;
-    state.selectedInst = null;
-    resetMoneyFilterToAll();
-    state.strikeExpandAll = false;
-    const expandCb = document.getElementById("opt-strike-expand-all");
-    if (expandCb) expandCb.checked = false;
-    parkOrderPanel();
-    updateUnderlyingLabel();
-    renderExpiries();
-    renderStrikes();
   }
 
   async function openPosition() {
@@ -1756,7 +1839,7 @@
     refreshPendingOrders();
     startPendingOrdersPoll();
     const hasCache =
-      panelCache.chain &&
+      chainHasExpiries(panelCache.chain) &&
       panelCache.underlying === state.underlying &&
       panelCache.optType === state.optType;
     if (hasCache) {
@@ -1764,6 +1847,8 @@
       renderExpiries();
       renderStrikes();
       refreshAllPositions();
+      // 后台静默刷新,避免缓存过期后到期日变空
+      loadChain({ soft: true });
       return;
     }
     requestAnimationFrame(function () {
diff --git a/lib/exchange/okx_options_lib.py b/lib/exchange/okx_options_lib.py
index eab0f4d..fdf053b 100644
--- a/lib/exchange/okx_options_lib.py
+++ b/lib/exchange/okx_options_lib.py
@@ -596,13 +596,10 @@ def fetch_option_instruments(
     ex: ccxt.okx,
     inst_family: str,
 ) -> list[dict[str, Any]]:
-    try:
-        rows = ex.public_get_public_instruments(
-            {"instType": "OPTION", "instFamily": inst_family}
-        ).get("data") or []
-        return [r for r in rows if isinstance(r, dict) and r.get("state") == "live"]
-    except Exception:
-        return []
+    rows = ex.public_get_public_instruments(
+        {"instType": "OPTION", "instFamily": inst_family}
+    ).get("data") or []
+    return [r for r in rows if isinstance(r, dict) and r.get("state") == "live"]
 
 
 def fetch_option_tickers(ex: ccxt.okx, inst_family: str) -> dict[str, dict[str, Any]]:
@@ -634,9 +631,27 @@ def build_option_chain(
     idx = index_px if index_px is not None else fetch_index_price(ex, uly)
     now_ms = time.time() * 1000
     max_ms = now_ms + max_dte_days * 86400 * 1000
-    instruments = fetch_option_instruments(ex, family)
+    instruments_err = ""
+    instruments: list[dict[str, Any]] = []
+    for attempt in range(2):
+        try:
+            instruments = fetch_option_instruments(ex, family)
+            instruments_err = ""
+            if instruments:
+                break
+            instruments_err = "期权合约列表为空"
+        except Exception as e:
+            instruments = []
+            instruments_err = str(e) or e.__class__.__name__
+            if attempt == 0:
+                time.sleep(0.35)
+                continue
+            break
+        if attempt == 0 and not instruments:
+            time.sleep(0.35)
     tickers = fetch_option_tickers(ex, family)
     expiries: dict[str, list[dict[str, Any]]] = {}
+    skipped_no_index = 0
     for meta in instruments:
         try:
             exp_ms = int(meta.get("expTime") or 0)
@@ -646,7 +661,10 @@ def build_option_chain(
             continue
         opt_type = str(meta.get("optType") or "")
         strike = _safe_float(meta.get("stk"))
-        if strike is None or idx is None:
+        if strike is None:
+            continue
+        if idx is None:
+            skipped_no_index += 1
             continue
         if itm_only and not is_shallow_itm(
             opt_type=opt_type,
@@ -702,7 +720,25 @@ def build_option_chain(
     for exp_ms_str, contracts in sorted(expiries.items(), key=lambda x: int(x[0])):
         contracts.sort(key=lambda c: (c["opt_type"], c["strike"]))
         exp_list.append({"exp_time": int(exp_ms_str), "contracts": contracts})
-    return {"underlying": u, "index_px": idx, "inst_family": family, "expiries": exp_list}
+    out: dict[str, Any] = {
+        "underlying": u,
+        "index_px": idx,
+        "inst_family": family,
+        "expiries": exp_list,
+        "instruments_count": len(instruments),
+    }
+    if not exp_list:
+        if instruments_err:
+            out["chain_error"] = f"拉取期权合约失败: {instruments_err}"
+        elif idx is None:
+            out["chain_error"] = "指数价获取失败,无法构建期权链"
+        elif skipped_no_index:
+            out["chain_error"] = "指数价缺失,合约已跳过"
+        elif instruments:
+            out["chain_error"] = f"近 {max_dte_days:g} 日内无可用到期(已过滤 {len(instruments)} 个合约)"
+        else:
+            out["chain_error"] = "期权合约列表为空,请稍后刷新"
+    return out
 
 
 def quote_option_contract(ex: ccxt.okx, inst_id: str) -> dict[str, Any]:
diff --git a/lib/options/options_register.py b/lib/options/options_register.py
index ea460df..fa5941e 100644
--- a/lib/options/options_register.py
+++ b/lib/options/options_register.py
@@ -353,13 +353,27 @@ def register_options_routes(app: Flask, cfg: dict[str, Any]) -> None:
         if ex is None:
             return jsonify({"ok": False, "msg": err})
         u = (request.args.get("underlying") or cfg["default_underly"]).upper()
-        chain = cfg["build_option_chain"](
-            ex,
-            u,
-            max_dte_days=cfg["chain_max_dte_days"],
-            itm_only=False,
-            itm_max_dist_usd=cfg["itm_max_dist"],
-        )
+        try:
+            chain = cfg["build_option_chain"](
+                ex,
+                u,
+                max_dte_days=cfg["chain_max_dte_days"],
+                itm_only=False,
+                itm_max_dist_usd=cfg["itm_max_dist"],
+            )
+        except Exception as e:
+            return jsonify({"ok": False, "msg": f"加载期权链失败: {e}"})
+        expiries = chain.get("expiries") or []
+        chain_err = chain.get("chain_error")
+        if not expiries:
+            return jsonify(
+                {
+                    "ok": False,
+                    "msg": chain_err or "暂无到期日,请稍后点「刷新链」",
+                    **chain,
+                    "chain_max_dte_days": cfg["chain_max_dte_days"],
+                }
+            )
         return jsonify({"ok": True, **chain, "chain_max_dte_days": cfg["chain_max_dte_days"]})
 
     @app.route("/api/options/quote")
diff --git a/lib/options/templates/options_panel.html b/lib/options/templates/options_panel.html
index 934c5a8..7a32bfc 100644
--- a/lib/options/templates/options_panel.html
+++ b/lib/options/templates/options_panel.html
@@ -273,4 +273,4 @@
     </div>
 </div>
 <script src="/static/options_expiry_countdown.js?v=1"></script>
-<script src="/static/options_panel.js?v=34"></script>
+<script src="/static/options_panel.js?v=35"></script>