diff --git a/backend/services/mining-service/src/api/controllers/mining.controller.ts b/backend/services/mining-service/src/api/controllers/mining.controller.ts
index 8a559b9b..c81ef2e4 100644
--- a/backend/services/mining-service/src/api/controllers/mining.controller.ts
+++ b/backend/services/mining-service/src/api/controllers/mining.controller.ts
@@ -1,9 +1,20 @@
-import { Controller, Get, Param, Query, NotFoundException } from '@nestjs/common';
+import { Controller, Get, Post, Param, Query, Body, NotFoundException, BadRequestException } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiParam, ApiQuery } from '@nestjs/swagger';
+import { IsString, IsOptional } from 'class-validator';
 import { GetMiningAccountQuery } from '../../application/queries/get-mining-account.query';
 import { GetMiningStatsQuery } from '../../application/queries/get-mining-stats.query';
 import { Public } from '../../shared/guards/jwt-auth.guard';
 import { PrismaService } from '../../infrastructure/persistence/prisma/prisma.service';
+import { Decimal } from '@prisma/client/runtime/library';
+
+class TransferDto {
+  @IsString()
+  amount: string;
+
+  @IsString()
+  @IsOptional()
+  transferNo?: string;
+}
 
 @ApiTags('Mining')
 @Controller('mining')
@@ -145,4 +156,129 @@ export class MiningController {
       pageSize ?? 50,
     );
   }
+
+  @Post('accounts/:accountSequence/transfer-out')
+  @ApiOperation({ summary: '从挖矿账户划出积分股（到交易账户）' })
+  @ApiParam({ name: 'accountSequence', description: '账户序号' })
+  @ApiResponse({ status: 200, description: '划出成功' })
+  @ApiResponse({ status: 400, description: '余额不足或参数错误' })
+  async transferOut(
+    @Param('accountSequence') accountSequence: string,
+    @Body() dto: TransferDto,
+  ) {
+    const amount = new Decimal(dto.amount);
+    if (amount.lessThanOrEqualTo(0)) {
+      throw new BadRequestException('Amount must be positive');
+    }
+
+    // 查找账户
+    const account = await this.prisma.miningAccount.findUnique({
+      where: { accountSequence },
+    });
+
+    if (!account) {
+      throw new NotFoundException(`Account ${accountSequence} not found`);
+    }
+
+    // 检查余额
+    if (new Decimal(account.availableBalance).lessThan(amount)) {
+      throw new BadRequestException('Insufficient balance');
+    }
+
+    // 执行划转（使用事务）
+    const txId = `TX${Date.now().toString(36)}${Math.random().toString(36).substring(2, 8)}`.toUpperCase();
+
+    await this.prisma.$transaction(async (tx) => {
+      // 扣减余额
+      const newBalance = new Decimal(account.availableBalance).minus(amount);
+      await tx.miningAccount.update({
+        where: { accountSequence },
+        data: { availableBalance: newBalance },
+      });
+
+      // 创建交易记录
+      await tx.miningTransaction.create({
+        data: {
+          accountSequence,
+          type: 'TRANSFER_OUT',
+          amount: amount.negated(),
+          balanceBefore: account.availableBalance,
+          balanceAfter: newBalance,
+          referenceId: dto.transferNo || txId,
+          referenceType: 'TRADING_TRANSFER',
+          memo: `划转到交易账户，金额: ${amount.toString()}`,
+        },
+      });
+    });
+
+    return {
+      success: true,
+      txId,
+      message: 'Transfer out successful',
+    };
+  }
+
+  @Post('accounts/:accountSequence/transfer-in')
+  @ApiOperation({ summary: '划入积分股到挖矿账户（从交易账户）' })
+  @ApiParam({ name: 'accountSequence', description: '账户序号' })
+  @ApiResponse({ status: 200, description: '划入成功' })
+  @ApiResponse({ status: 400, description: '参数错误' })
+  async transferIn(
+    @Param('accountSequence') accountSequence: string,
+    @Body() dto: TransferDto,
+  ) {
+    const amount = new Decimal(dto.amount);
+    if (amount.lessThanOrEqualTo(0)) {
+      throw new BadRequestException('Amount must be positive');
+    }
+
+    const txId = `TX${Date.now().toString(36)}${Math.random().toString(36).substring(2, 8)}`.toUpperCase();
+
+    await this.prisma.$transaction(async (tx) => {
+      // 查找或创建账户
+      let account = await tx.miningAccount.findUnique({
+        where: { accountSequence },
+      });
+
+      if (!account) {
+        // 创建账户
+        account = await tx.miningAccount.create({
+          data: {
+            accountSequence,
+            totalMined: new Decimal(0),
+            availableBalance: new Decimal(0),
+            frozenBalance: new Decimal(0),
+            totalContribution: new Decimal(0),
+          },
+        });
+      }
+
+      // 增加余额
+      const newBalance = new Decimal(account.availableBalance).plus(amount);
+      await tx.miningAccount.update({
+        where: { accountSequence },
+        data: { availableBalance: newBalance },
+      });
+
+      // 创建交易记录
+      await tx.miningTransaction.create({
+        data: {
+          accountSequence,
+          type: 'TRANSFER_IN',
+          amount,
+          balanceBefore: account.availableBalance,
+          balanceAfter: newBalance,
+          referenceId: dto.transferNo || txId,
+          referenceType: 'TRADING_TRANSFER',
+          memo: `从交易账户划入，金额: ${amount.toString()}`,
+        },
+      });
+    });
+
+    return {
+      success: true,
+      txId,
+      message: 'Transfer in successful',
+    };
+  }
 }
diff --git a/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart b/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart
index 12124d7f..796b594a 100644
--- a/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart
+++ b/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart
@@ -703,11 +703,16 @@ class _KlineChartWidgetState extends State<KlineChartWidget> {
     }
 
     final range = maxPrice - minPrice;
-    final padding = range * 0.1;
+    // 防止 range 为 0 导致 NaN
+    final safeRange = range > 0 ? range : (maxPrice > 0 ? maxPrice * 0.1 : 1.0);
+    final padding = safeRange * 0.1;
     minPrice -= padding;
     maxPrice += padding;
 
-    final y = 10 + ((maxPrice - price) / (maxPrice - minPrice)) * (chartHeight - 20);
+    final adjustedRange = maxPrice - minPrice;
+    if (adjustedRange <= 0) return chartHeight / 2;
+
+    final y = 10 + ((maxPrice - price) / adjustedRange) * (chartHeight - 20);
     return y.clamp(0.0, chartHeight - 20);
   }
 }
diff --git a/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_painter.dart b/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_painter.dart
index b20ea133..d65e92b5 100644
--- a/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_painter.dart
+++ b/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_painter.dart
@@ -100,13 +100,16 @@ class KlinePainter extends CustomPainter {
 
     // 添加上下留白
     final priceRange = maxPrice - minPrice;
-    final padding = priceRange * 0.1;
+    // 避免 priceRange 为 0 导致 NaN
+    final safePriceRange = priceRange > 0 ? priceRange : (maxPrice > 0 ? maxPrice * 0.1 : 1.0);
+    final padding = safePriceRange * 0.1;
     minPrice -= padding;
     maxPrice += padding;
     final adjustedRange = maxPrice - minPrice;
 
     // Y坐标转换函数
     double priceToY(double price) {
+      if (adjustedRange <= 0) return topPadding + chartHeight / 2;
       return topPadding + ((maxPrice - price) / adjustedRange) * chartHeight;
     }