diff --git a/frontend/app/trades/page.tsx b/frontend/app/trades/page.tsx
index 200cfd7..06c2bf5 100644
--- a/frontend/app/trades/page.tsx
+++ b/frontend/app/trades/page.tsx
@@ -32,6 +32,12 @@ interface SummaryBar {
 type Symbol = "BTC" | "ETH" | "XRP" | "SOL";
 type Interval = "1m" | "5m" | "15m" | "1h";
 
+// 价格格式化：<100显示4位小数，>=100显示1位
+function fmtPrice(p: number): string {
+  const digits = p < 100 ? 4 : 1;
+  return p.toLocaleString("en-US", { minimumFractionDigits: digits, maximumFractionDigits: digits });
+}
+
 const INTERVALS: { label: string; value: Interval }[] = [
   { label: "1m", value: "1m" },
   { label: "5m", value: "5m" },
@@ -117,7 +123,7 @@ function LiveTrades({ symbol }: { symbol: Symbol }) {
               {trades.map(t => (
                 <tr key={t.agg_id} className="border-b border-slate-50 hover:bg-slate-50">
                   <td className={`px-3 py-1.5 font-mono font-semibold ${t.is_buyer_maker === 0 ? "text-emerald-600" : "text-red-500"}`}>
-                    {t.is_buyer_maker === 0 ? "▲" : "▼"} {t.price.toLocaleString("en-US", { minimumFractionDigits: 1, maximumFractionDigits: 1 })}
+                    {t.is_buyer_maker === 0 ? "▲" : "▼"} {fmtPrice(t.price)}
                   </td>
                   <td className="px-3 py-1.5 text-right font-mono text-slate-600">
                     {t.qty >= 1000 ? `${(t.qty/1000).toFixed(2)}K` : t.qty.toFixed(symbol === "BTC" ? 4 : 3)}
@@ -273,12 +279,12 @@ function FlowAnalysis({ symbol }: { symbol: Symbol }) {
                 {/* 右轴：价格，自适应波动范围 */}
                 <YAxis yAxisId="price" orientation="right" tick={{ fill: "#f59e0b", fontSize: 10 }} tickLine={false} axisLine={false} width={65}
                   domain={[priceYMin, priceYMax]}
-                  tickFormatter={(v: number) => v >= 1000 ? `$${(v/1000).toFixed(1)}k` : `$${v.toFixed(0)}`}
+                  tickFormatter={(v: number) => v >= 1000 ? `$${(v/1000).toFixed(1)}k` : `$${fmtPrice(v)}`}
                 />
                 <Tooltip
                   // eslint-disable-next-line @typescript-eslint/no-explicit-any
                   formatter={(v: any, name: any) => {
-                    if (name === "price") return [`$${Number(v).toLocaleString("en-US", { minimumFractionDigits: 1, maximumFractionDigits: 1 })}`, "币价(VWAP)"];
+                    if (name === "price") return [`$${fmtPrice(Number(v))}`, "币价(VWAP)"];
                     return [`${Number(v).toFixed(2)}`, "Delta"];
                   }}
                   contentStyle={{ background: "#fff", border: "1px solid #e2e8f0", borderRadius: 8, fontSize: 11 }}