diff --git a/src/api/cryptoChart.ts b/src/api/cryptoChart.ts
index 21cdabb..6bb7b9d 100644
--- a/src/api/cryptoChart.ts
+++ b/src/api/cryptoChart.ts
@@ -191,9 +191,10 @@ export interface FetchCryptoChartResponse {
  */
 async function fetchBinanceKlines(
   binanceSymbol: string,
-  limit: number
+  limit: number,
+  interval: '1s' | '1m' = '1m'
 ): Promise<CryptoChartPoint[]> {
-  const url = `${BINANCE_REST}/klines?symbol=${binanceSymbol}&interval=1m&limit=${limit}`
+  const url = `${BINANCE_REST}/klines?symbol=${binanceSymbol}&interval=${interval}&limit=${limit}`
   const res = await fetch(url)
   if (!res.ok) throw new Error(`Binance API: ${res.status}`)
   const raw = (await res.json()) as [number, string, string, string, string, number, ...unknown[]][]
@@ -223,9 +224,41 @@ async function fetchCoinGeckoChart(
 
 /**
  * 拉取加密货币价格历史
- * 优先 Binance（1 分钟粒度），不支持时回退 CoinGecko
+ * 优先 Binance（1 分钟粒度；30S 场景为 1 秒粒度以铺满视窗），不支持时回退 CoinGecko
  */
-const THIRTY_SEC_MS = 30 * 1000
+/**
+ * 30S 细粒度模式下内存中保留的历史跨度（毫秒）。
+ * 需 ≥ 图表 timeScale 实际展示的时间宽度；仅用「最近 30s」裁剪时会把已拉取的 1s K 线丢掉大半，屏内左侧会变空。
+ */
+export const CRYPTO_30S_RETENTION_MS = 120 * 1000
+
+/** 30S 初始：拉取的 1s K 线条数，应略大于 {@link CRYPTO_30S_RETENTION_MS}（秒）以抵消网络延迟与 K 线闭合同步 */
+const CRYPTO_30S_INITIAL_1S_LIMIT = 150
+
+/** 加密货币分时折线图 X 轴 / 补点统一时间步长（ms），与图表 timeScale 一致 */
+export const CRYPTO_CHART_TIME_STEP_MS = 100
+
+/** 将毫秒时间戳对齐到 {@link CRYPTO_CHART_TIME_STEP_MS} 网格（向下取整，单调递增友好） */
+export function alignCryptoChartTimeMs(tsMs: number): number {
+  const step = CRYPTO_CHART_TIME_STEP_MS
+  return Math.floor(tsMs / step) * step
+}
+
+/** 同一时间对齐戳保留最后一条，避免与 realtime 合并时重复键 */
+function dedupeLatestByTime(points: CryptoChartPoint[]): CryptoChartPoint[] {
+  if (points.length <= 1) return points
+  const sorted = [...points].sort((a, b) => a[0] - b[0])
+  const out: CryptoChartPoint[] = []
+  for (const pt of sorted) {
+    const last = out[out.length - 1]
+    if (last && last[0] === pt[0]) {
+      out[out.length - 1] = pt
+    } else {
+      out.push(pt)
+    }
+  }
+  return out
+}
 
 export async function fetchCryptoChart(
   params: FetchCryptoChartParams
@@ -243,10 +276,21 @@ export async function fetchCryptoChart(
 
   try {
     if (useBinance) {
-      let points = await fetchBinanceKlines(binanceSymbol, limit)
+      let points: CryptoChartPoint[]
       if (is30S) {
-        const cutoff = Date.now() - THIRTY_SEC_MS
-        points = points.filter(([ts]) => ts >= cutoff)
+        points = await fetchBinanceKlines(
+          binanceSymbol,
+          Math.min(CRYPTO_30S_INITIAL_1S_LIMIT, 1000),
+          '1s'
+        )
+        const cutoff = Date.now() - CRYPTO_30S_RETENTION_MS
+        points = dedupeLatestByTime(
+          points
+            .map(([ts, p]) => [alignCryptoChartTimeMs(ts), p] as CryptoChartPoint)
+            .filter(([ts]) => ts >= cutoff)
+        )
+      } else {
+        points = await fetchBinanceKlines(binanceSymbol, limit, '1m')
       }
       return { code: 0, data: points, msg: 'ok' }
     }
@@ -254,7 +298,7 @@ export async function fetchCryptoChart(
     const days = RANGE_TO_DAYS[fetchRange] ?? 7
     let points = await fetchCoinGeckoChart(coinId, days)
     if (is30S) {
-      const cutoff = Date.now() - THIRTY_SEC_MS
+      const cutoff = Date.now() - CRYPTO_30S_RETENTION_MS
       points = points.filter(([ts]) => ts >= cutoff)
     }
     return { code: 0, data: points, msg: 'ok' }
@@ -278,15 +322,6 @@ interface BinanceAggTradeMsg {
 
 const CRYPTO_UPDATE_THROTTLE_MS = 80
 
-/** 加密货币分时折线图 X 轴 / 补点统一时间步长（ms），与图表 timeScale 一致 */
-export const CRYPTO_CHART_TIME_STEP_MS = 100
-
-/** 将毫秒时间戳对齐到 {@link CRYPTO_CHART_TIME_STEP_MS} 网格（向下取整，单调递增友好） */
-export function alignCryptoChartTimeMs(tsMs: number): number {
-  const step = CRYPTO_CHART_TIME_STEP_MS
-  return Math.floor(tsMs / step) * step
-}
-
 /**
  * 订阅 Binance 归集交易 WebSocket（aggTrade），实现更丝滑的实时走势
  * 参考：https://developers.binance.com/docs/zh-CN/binance-spot-api-docs/web-socket-streams#归集交易
diff --git a/src/views/TradeDetail.vue b/src/views/TradeDetail.vue
index 32845f0..6d4940f 100644
--- a/src/views/TradeDetail.vue
+++ b/src/views/TradeDetail.vue
@@ -414,6 +414,7 @@ import {
   subscribeCryptoRealtime,
   alignCryptoChartTimeMs,
   CRYPTO_CHART_TIME_STEP_MS,
+  CRYPTO_30S_RETENTION_MS,
 } from '../api/cryptoChart'
 
 const { t } = useI18n()
@@ -1225,7 +1226,7 @@ const lineColor = '#2563eb'
 /** 叠加价格轴 ID：曲线绑定在 overlay scale，主图占满宽；Y 轴数字由 InPanePriceScalePrimitive 画在图内 */
 const CHART_OVERLAY_PRICE_SCALE_ID = 'overlay-price'
 /** 右侧留白（px）：fitContent 时压缩可用宽度，线头略离开物理右缘，lastPrice 水波能露出一半且不依赖超大 rightOffset（bars） */
-const CHART_RIPPLE_RIGHT_PAD_PX = 28
+const CHART_RIPPLE_RIGHT_PAD_PX = 0
 
 function ensureChartSeries() {
   if (!chartInstance || !chartContainerRef.value) return
@@ -1392,7 +1393,7 @@ function applyCryptoRealtimePoint(point: [number, number]) {
   let updatePoint: [number, number] | null = null
 
   if (range === '30S') {
-    const cutoff = Date.now() - 30 * 1000
+    const cutoff = Date.now() - CRYPTO_30S_RETENTION_MS
     if (prevLastT != null && ts === prevLastT) {
       list[list.length - 1] = [ts, price]
     } else {