diff --git a/app/dashboard/assets/page.tsx b/app/dashboard/assets/page.tsx
index 27a3c06..fca5edb 100644
--- a/app/dashboard/assets/page.tsx
+++ b/app/dashboard/assets/page.tsx
@@ -10,6 +10,7 @@ import {
   TableHeader,
   TableRow,
 } from '@/components/ui/table';
+import Big from 'big.js';
 
 export default async function AssetsPage() {
   const assets = await getAssets();
@@ -53,14 +54,14 @@ export default async function AssetsPage() {
                   <TableCell className="font-medium">{asset.symbol}</TableCell>
                   <TableCell>{typeLabels[asset.type] || asset.type}</TableCell>
                   <TableCell>{asset.baseCurrency}</TableCell>
-                  <TableCell>{asset.latestPrice}</TableCell>
+                  <TableCell>{asset.latestPrice ? new Big(asset.latestPrice).toString() : '-'}</TableCell>
                   <TableCell>
                     {asset.createdAt
                       ? new Date(asset.createdAt).toLocaleString('zh-CN')
                       : '-'}
                   </TableCell>
                   <TableCell>
-                    <UpdatePriceDialog assetId={asset.id} currentPrice={asset.latestPrice || '0'} />
+                    <UpdatePriceDialog assetId={asset.id} currentPrice={asset.latestPrice ? new Big(asset.latestPrice).toString() : '0'} />
                   </TableCell>
                 </TableRow>
               ))
diff --git a/app/dashboard/page.tsx b/app/dashboard/page.tsx
index d97dd54..b30ec1d 100644
--- a/app/dashboard/page.tsx
+++ b/app/dashboard/page.tsx
@@ -90,21 +90,33 @@ export default async function DashboardPage() {
                       <span className="font-medium">{pos.baseCurrency}</span>
                     </div>
                     <div className="flex justify-between">
-                      <span className="text-muted-foreground">CNY 估值</span>
-                      <span className="font-medium text-green-600">
-                        ¥{formatAmount(pos.cnyValue)}
+                      <span className="text-muted-foreground">持仓成本 ({pos.baseCurrency})</span>
+                      <span className="font-medium">
+                        {formatAmount(pos.totalCostNative)}
                       </span>
                     </div>
-                    <div className="flex justify-between">
+                    {(() => {
+                      const posPnlNative = new Big(pos.pnlNative);
+                      const posPnlNativePositive = posPnlNative.gte(0);
+                      return (
+                        <div className="flex justify-between">
+                          <span className="text-muted-foreground">当前盈亏 ({pos.baseCurrency})</span>
+                          <span className={`font-semibold ${posPnlNativePositive ? 'text-green-500' : 'text-red-500'}`}>
+                            {posPnlNativePositive ? '+' : ''}{formatAmount(pos.pnlNative)}
+                          </span>
+                        </div>
+                      );
+                    })()}
+                    <div className="flex justify-between opacity-50">
                       <span className="text-muted-foreground">成本 (CNY)</span>
                       <span className="font-medium">
                         ¥{formatAmount(pos.totalCostCny)}
                       </span>
                     </div>
-                    <div className="flex justify-between">
-                      <span className="text-muted-foreground">盈亏</span>
+                    <div className="flex justify-between opacity-50">
+                      <span className="text-muted-foreground">盈亏 (CNY)</span>
                       <span className={`font-semibold ${posPnlPositive ? 'text-green-500' : 'text-red-500'}`}>
-                        {posPnlPositive ? '+' : ''}{formattedPosPnl}
+                        {posPnlPositive ? '+' : ''}{formatAmount(pos.pnlCny)}
                       </span>
                     </div>
                   </div>
diff --git a/src/actions/portfolio.ts b/src/actions/portfolio.ts
index 0279a82..7cc9741 100644
--- a/src/actions/portfolio.ts
+++ b/src/actions/portfolio.ts
@@ -14,6 +14,8 @@ interface Position {
   cnyValue: string;
   totalCostCny: string;
   pnlCny: string;
+  totalCostNative: string;
+  pnlNative: string;
 }
 
 interface RawRate {
@@ -95,6 +97,7 @@ export async function getPortfolioPositions(): Promise<Position[]> {
     baseCurrency: string;
     latestPrice: string;
     totalCostCny: Big;
+    totalCostNative: Big;
   }>();
 
   for (const tx of allTransactions) {
@@ -110,6 +113,7 @@ export async function getPortfolioPositions(): Promise<Position[]> {
         baseCurrency: tx.assetBaseCurrency || '',
         latestPrice: tx.assetLatestPrice || '0',
         totalCostCny: new Big('0'),
+        totalCostNative: new Big('0'),
       });
     }
 
@@ -118,10 +122,15 @@ export async function getPortfolioPositions(): Promise<Position[]> {
     if (tx.txType === 'BUY') {
       holding.quantity = holding.quantity.plus(new Big(tx.quantity));
       const costPerUnit = new Big(tx.quantity).times(new Big(tx.price));
+      holding.totalCostNative = holding.totalCostNative.plus(costPerUnit);
       const costCny = costPerUnit.times(new Big(tx.exchangeRate || '1'));
       holding.totalCostCny = holding.totalCostCny.plus(costCny);
     } else if (tx.txType === 'SELL') {
       holding.quantity = holding.quantity.minus(new Big(tx.quantity));
+      const sellCostPerUnit = new Big(tx.quantity).times(new Big(tx.price));
+      holding.totalCostNative = holding.totalCostNative.minus(sellCostPerUnit);
+      const sellCostCny = sellCostPerUnit.times(new Big(tx.exchangeRate || '1'));
+      holding.totalCostCny = holding.totalCostCny.minus(sellCostCny);
     } else if (tx.txType === 'AIRDROP') {
       holding.quantity = holding.quantity.plus(new Big(tx.quantity));
     } else if (tx.txType === 'DIVIDEND') {
@@ -160,6 +169,9 @@ export async function getPortfolioPositions(): Promise<Position[]> {
     const pnlCny = cnyValue.minus(holding.totalCostCny);
     totalPnlCny = totalPnlCny.plus(pnlCny);
 
+    const currentNativeValue = new Big(holding.latestPrice).times(holding.quantity);
+    const pnlNative = currentNativeValue.minus(holding.totalCostNative);
+
     result.push({
       assetId: holding.assetId,
       symbol: holding.symbol,
@@ -169,6 +181,8 @@ export async function getPortfolioPositions(): Promise<Position[]> {
       cnyValue: cnyValue.toString(),
       totalCostCny: holding.totalCostCny.toString(),
       pnlCny: pnlCny.toString(),
+      totalCostNative: holding.totalCostNative.toString(),
+      pnlNative: pnlNative.toString(),
     });
   }
 
diff --git a/src/components/transactions/add-transaction-dialog.tsx b/src/components/transactions/add-transaction-dialog.tsx
index 44a960f..99dbe86 100644
--- a/src/components/transactions/add-transaction-dialog.tsx
+++ b/src/components/transactions/add-transaction-dialog.tsx
@@ -218,9 +218,18 @@ export function AddTransactionDialog({ assets }: AddTransactionDialogProps) {
                 render={({ field }) => (
                   <FormItem>
                     <FormLabel>交易币种</FormLabel>
-                    <FormControl>
-                      <Input placeholder="USD" type="text" {...field} />
-                    </FormControl>
+                    <Select onValueChange={field.onChange} defaultValue={field.value}>
+                      <FormControl>
+                        <SelectTrigger>
+                          <SelectValue placeholder="选择币种" />
+                        </SelectTrigger>
+                      </FormControl>
+                      <SelectContent>
+                        <SelectItem value="USD">USD</SelectItem>
+                        <SelectItem value="CNY">CNY</SelectItem>
+                        <SelectItem value="HKD">HKD</SelectItem>
+                      </SelectContent>
+                    </Select>
                     <FormMessage />
                   </FormItem>
                 )}