diff --git a/docs/components/TradeComponent.md b/docs/components/TradeComponent.md
index a5039d9..a07a4e6 100644
--- a/docs/components/TradeComponent.md
+++ b/docs/components/TradeComponent.md
@@ -37,6 +37,7 @@ interface TradePositionItem {
   - 事件处理：`onAmountInput`、`onAmountKeydown`、`onAmountPaste`
 - 余额不足时 Buy 显示 Deposit 按钮
 - 25%/50%/Max 快捷份额
+- **Sell 模式份额默认取最大可卖**：切换至 Sell 或 maxAvailableShares 变化时自动调用 `setMaxShares()`，将 shares 设为最大可卖数量（无可卖时为 0）
 - **Sell 模式 UI 优化**：
   - Shares 标签与 Max shares 提示同行显示（`max-shares-inline`）
   - 输入框独占一行（`shares-input-wrapper`）
diff --git a/docs/views/TradeDetail.md b/docs/views/TradeDetail.md
index 4d970f5..a7b1092 100644
--- a/docs/views/TradeDetail.md
+++ b/docs/views/TradeDetail.md
@@ -17,6 +17,8 @@
 - 移动端：底部栏 + `v-bottom-sheet` 嵌入 `TradeComponent`
 - Merge/Split：通过 `TradeComponent` 或底部菜单触发，成功后监听 `mergeSuccess`/`splitSuccess` 事件刷新持仓
 - **401 权限错误**：加载详情失败时，通过 `useAuthError().formatAuthError` 统一提示「请先登录」或「权限不足」
+- **Sell 弹窗 emitsOptions 竞态**：`sellDialogRenderContent` 延迟 350ms 卸载 TradeComponent，等 v-dialog transition 完成，避免 Vue patch 时组件实例为 null 的 `emitsOptions` 错误
+- **底部栏 slot 竞态**：`tradeSheetRenderContent` 延迟 50ms 挂载、350ms 卸载 TradeComponent，避免 v-bottom-sheet transition 期间 VTextField 触发「Slot default invoked outside of the render function」警告
 
 ## 使用方式
 
diff --git a/src/components/TradeComponent.vue b/src/components/TradeComponent.vue
index 9657884..21dadc3 100644
--- a/src/components/TradeComponent.vue
+++ b/src/components/TradeComponent.vue
@@ -1748,6 +1748,18 @@ const maxAvailableShares = computed(() => {
   return Math.floor(currentOptionPositionShares.value)
 })
 
+/** 将 shares 限制为正整数（>= 1） */
+function clampShares(v: number): number {
+  const n = Math.floor(Number.isFinite(v) ? v : 1)
+  return Math.max(1, n)
+}
+
+// 设置最大份额（基于当前选项的持仓）；Sell 模式下份额默认取最大可卖数量
+const setMaxShares = () => {
+  const maxShares = currentOptionPositionShares.value
+  shares.value = maxShares > 0 ? clampShares(maxShares) : 0
+}
+
 function applyInitialOption(option: 'yes' | 'no') {
   selectedOption.value = option
   syncLimitPriceFromMarket()
@@ -1769,6 +1781,7 @@ onMounted(() => {
   if (props.initialOption) applyInitialOption(props.initialOption)
   else if (props.market) syncLimitPriceFromMarket()
   if (props.initialTab) activeTab.value = props.initialTab
+  if (activeTab.value === 'sell') setMaxShares()
 })
 watch(
   () => props.initialOption,
@@ -1810,14 +1823,18 @@ watch(
 watch(
   () => [activeTab.value, maxAvailableShares.value] as const,
   ([tab, max]) => {
-    if (tab === 'sell' && (!Number.isFinite(max) || max <= 0)) {
-      orderError.value = t('activity.noAvailableSharesToSell')
-      isNoAvailableSharesError.value = true
-    } else if (tab !== 'sell' || (Number.isFinite(max) && max > 0)) {
-      if (isNoAvailableSharesError.value) {
+    if (tab === 'sell') {
+      setMaxShares()
+      if (!Number.isFinite(max) || max <= 0) {
+        orderError.value = t('activity.noAvailableSharesToSell')
+        isNoAvailableSharesError.value = true
+      } else if (isNoAvailableSharesError.value) {
         orderError.value = ''
         isNoAvailableSharesError.value = false
       }
+    } else if (isNoAvailableSharesError.value) {
+      orderError.value = ''
+      isNoAvailableSharesError.value = false
     }
   },
   { immediate: true },
@@ -1885,12 +1902,6 @@ const increasePrice = () => {
   limitPrice.value = ALLOWED_LIMIT_PRICES[nextIdx] ?? limitPrice.value
 }
 
-/** 将 shares 限制为正整数（>= 1） */
-function clampShares(v: number): number {
-  const n = Math.floor(Number.isFinite(v) ? v : 1)
-  return Math.max(1, n)
-}
-
 /** 仅在值为正整数时更新 shares */
 function onSharesInput(v: unknown) {
   const num = v == null ? NaN : Number(v)
@@ -1979,14 +1990,6 @@ const setMaxAmount = () => {
   amount.value = balance.value
 }
 
-// 设置最大份额（基于当前选项的持仓）
-const setMaxShares = () => {
-  const maxShares = currentOptionPositionShares.value
-  if (maxShares > 0) {
-    shares.value = clampShares(maxShares)
-  }
-}
-
 /** Buy 模式：余额是否足够（>= 所需金额且不为 0）。cost：balance>0 时用 totalPrice，否则用 amount */
 const canAffordBuy = computed(() => {
   const bal = balance.value
diff --git a/src/views/EventMarkets.vue b/src/views/EventMarkets.vue
index ee84214..0d8a847 100644
--- a/src/views/EventMarkets.vue
+++ b/src/views/EventMarkets.vue
@@ -192,6 +192,7 @@
       <template v-if="isMobile && markets.length > 0">
         <v-bottom-sheet v-model="tradeSheetOpen" content-class="event-markets-trade-sheet">
           <TradeComponent
+            v-if="tradeSheetRenderContent"
             ref="tradeComponentRef"
             :key="`trade-${selectedMarketIndex}-${tradeInitialOption}`"
             :market="tradeMarketPayload"
@@ -245,6 +246,8 @@ const selectedMarketIndex = ref(0)
 const tradeInitialOption = ref<'yes' | 'no' | undefined>(undefined)
 /** 移动端交易弹窗开关 */
 const tradeSheetOpen = ref(false)
+/** 控制底部栏内 TradeComponent 的渲染，延迟挂载以避免 slot 竞态警告 */
+const tradeSheetRenderContent = ref(false)
 /** 移动端底部栏三点菜单开关 */
 const mobileMenuOpen = ref(false)
 /** TradeComponent 引用，用于从底部栏触发 Merge/Split */
@@ -714,11 +717,38 @@ onMounted(() => {
   loadEventDetail()
   window.addEventListener('resize', handleResize)
 })
+let tradeSheetUnmountTimer: ReturnType<typeof setTimeout> | undefined
+let tradeSheetMountTimer: ReturnType<typeof setTimeout> | undefined
+watch(tradeSheetOpen, (open) => {
+  if (open) {
+    if (tradeSheetUnmountTimer) {
+      clearTimeout(tradeSheetUnmountTimer)
+      tradeSheetUnmountTimer = undefined
+    }
+    if (tradeSheetMountTimer) clearTimeout(tradeSheetMountTimer)
+    tradeSheetMountTimer = setTimeout(() => {
+      tradeSheetRenderContent.value = true
+      tradeSheetMountTimer = undefined
+    }, 50)
+  } else {
+    if (tradeSheetMountTimer) {
+      clearTimeout(tradeSheetMountTimer)
+      tradeSheetMountTimer = undefined
+    }
+    tradeSheetUnmountTimer = setTimeout(() => {
+      tradeSheetRenderContent.value = false
+      tradeSheetUnmountTimer = undefined
+    }, 350)
+  }
+}, { immediate: true })
+
 onUnmounted(() => {
   stopDynamicUpdate()
   window.removeEventListener('resize', handleResize)
   chartInstance?.dispose()
   chartInstance = null
+  if (tradeSheetUnmountTimer) clearTimeout(tradeSheetUnmountTimer)
+  if (tradeSheetMountTimer) clearTimeout(tradeSheetMountTimer)
 })
 
 watch(
diff --git a/src/views/TradeDetail.vue b/src/views/TradeDetail.vue
index 39f004e..9e14cc6 100644
--- a/src/views/TradeDetail.vue
+++ b/src/views/TradeDetail.vue
@@ -290,6 +290,7 @@
         </div>
         <v-bottom-sheet v-model="tradeSheetOpen" content-class="trade-detail-trade-sheet">
           <TradeComponent
+            v-if="tradeSheetRenderContent"
             ref="mobileTradeComponentRef"
             :market="tradeMarketPayload"
             :initial-option="tradeInitialOptionFromBar"
@@ -311,7 +312,7 @@
         transition="dialog-transition"
       >
         <TradeComponent
-          v-if="sellDialogOpen"
+          v-if="sellDialogRenderContent"
           :market="tradeMarketPayload"
           :initial-option="sellInitialOption"
           :initial-tab="'sell'"
@@ -740,8 +741,12 @@ const tradeInitialOptionFromBar = ref<'yes' | 'no' | undefined>(undefined)
 const tradeInitialTabFromBar = ref<'buy' | 'sell' | undefined>(undefined)
 /** 移动端交易弹窗开关 */
 const tradeSheetOpen = ref(false)
+/** 控制底部栏内 TradeComponent 的渲染，延迟挂载以避免 slot 竞态警告 */
+const tradeSheetRenderContent = ref(false)
 /** 从持仓 Sell 打开的弹窗 */
 const sellDialogOpen = ref(false)
+/** 控制 Sell 弹窗内 TradeComponent 的渲染，延迟卸载以避免 emitsOptions 竞态 */
+const sellDialogRenderContent = ref(false)
 /** 从持仓 Sell 时预选的 Yes/No */
 const sellInitialOption = ref<'yes' | 'no'>('yes')
 /** 移动端三点菜单开关 */
@@ -823,6 +828,54 @@ function onSellOrderSuccess() {
   onOrderSuccess()
 }
 
+// 延迟卸载 Sell 弹窗内容，等 dialog transition 完成，避免 emitsOptions 竞态
+let sellDialogUnmountTimer: ReturnType<typeof setTimeout> | undefined
+watch(sellDialogOpen, (open) => {
+  if (open) {
+    if (sellDialogUnmountTimer) {
+      clearTimeout(sellDialogUnmountTimer)
+      sellDialogUnmountTimer = undefined
+    }
+    sellDialogRenderContent.value = true
+  } else {
+    sellDialogUnmountTimer = setTimeout(() => {
+      sellDialogRenderContent.value = false
+      sellDialogUnmountTimer = undefined
+    }, 350)
+  }
+}, { immediate: true })
+onUnmounted(() => {
+  if (sellDialogUnmountTimer) clearTimeout(sellDialogUnmountTimer)
+  if (tradeSheetUnmountTimer) clearTimeout(tradeSheetUnmountTimer)
+  if (tradeSheetMountTimer) clearTimeout(tradeSheetMountTimer)
+})
+
+// 底部栏 TradeComponent 延迟挂载/卸载，避免 transition 期间 slot 竞态
+let tradeSheetUnmountTimer: ReturnType<typeof setTimeout> | undefined
+let tradeSheetMountTimer: ReturnType<typeof setTimeout> | undefined
+watch(tradeSheetOpen, (open) => {
+  if (open) {
+    if (tradeSheetUnmountTimer) {
+      clearTimeout(tradeSheetUnmountTimer)
+      tradeSheetUnmountTimer = undefined
+    }
+    if (tradeSheetMountTimer) clearTimeout(tradeSheetMountTimer)
+    tradeSheetMountTimer = setTimeout(() => {
+      tradeSheetRenderContent.value = true
+      tradeSheetMountTimer = undefined
+    }, 50)
+  } else {
+    if (tradeSheetMountTimer) {
+      clearTimeout(tradeSheetMountTimer)
+      tradeSheetMountTimer = undefined
+    }
+    tradeSheetUnmountTimer = setTimeout(() => {
+      tradeSheetRenderContent.value = false
+      tradeSheetUnmountTimer = undefined
+    }, 350)
+  }
+}, { immediate: true })
+
 // 当前市场的 marketID，用于筛选持仓和订单
 const currentMarketId = computed(() => getMarketId(currentMarket.value))