diff --git a/backend/services/trading-service/src/application/services/transfer.service.ts b/backend/services/trading-service/src/application/services/transfer.service.ts
index c921f39c..6702c35a 100644
--- a/backend/services/trading-service/src/application/services/transfer.service.ts
+++ b/backend/services/trading-service/src/application/services/transfer.service.ts
@@ -16,7 +16,7 @@ export class TransferService {
     private readonly prisma: PrismaService,
     private readonly configService: ConfigService,
   ) {
-    this.minTransferAmount = this.configService.get<number>('MIN_TRANSFER_AMOUNT', 5);
+    this.minTransferAmount = this.configService.get<number>('MIN_TRANSFER_AMOUNT', 0.01);
     this.miningServiceUrl = this.configService.get<string>('MINING_SERVICE_URL', 'http://localhost:3021');
   }
 
diff --git a/frontend/mining-app/lib/presentation/pages/trading/trading_page.dart b/frontend/mining-app/lib/presentation/pages/trading/trading_page.dart
index 577065ff..d62672b8 100644
--- a/frontend/mining-app/lib/presentation/pages/trading/trading_page.dart
+++ b/frontend/mining-app/lib/presentation/pages/trading/trading_page.dart
@@ -577,12 +577,13 @@ class _TradingPageState extends ConsumerState<TradingPage> {
             _buildInputField('价格', _priceController, '请输入价格', '积分值'),
             const SizedBox(height: 16),
             // 数量输入 - 带"全部"按钮
+            // 卖出时使用交易账户积分股余额（只能卖出交易账户的，挖矿账户需要先划转）
             _buildQuantityInputField(
               '数量',
               _quantityController,
               '请输入数量',
               '积分股',
-              _selectedTab == 1 ? availableShares : null,
+              _selectedTab == 1 ? tradingShareBalance : null,
               _selectedTab == 0 ? availableCash : null,
               currentPrice,
             ),
@@ -1420,7 +1421,7 @@ class _TransferBottomSheetState extends ConsumerState<_TransferBottomSheet> {
                 mainAxisAlignment: MainAxisAlignment.spaceBetween,
                 children: [
                   const Text(
-                    '提示: 最低划转数量为 5 积分股',
+                    '提示: 最低划转数量为 0.01 积分股',
                     style: TextStyle(fontSize: 12, color: _grayText),
                   ),
                   GestureDetector(
@@ -1489,9 +1490,9 @@ class _TransferBottomSheetState extends ConsumerState<_TransferBottomSheet> {
     }
 
     final amountValue = double.tryParse(amount) ?? 0;
-    if (amountValue < 5) {
+    if (amountValue < 0.01) {
       ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('最低划转数量为 5 积分股')),
+        const SnackBar(content: Text('最低划转数量为 0.01 积分股')),
       );
       return;
     }