diff --git a/frontend/paper-trading.html b/frontend/paper-trading.html
index 23f5ac1..145df25 100644
--- a/frontend/paper-trading.html
+++ b/frontend/paper-trading.html
@@ -1532,7 +1532,8 @@
                     dailyReturns: [],
                     loadingReturns: false,
                     balanceChart: null,
-                    returnsChart: null
+                    returnsChart: null,
+                    _renderingCharts: false  // 防止重复渲染标志
                 };
             },
             mounted() {
@@ -1923,8 +1924,22 @@
 
                 // 渲染图表
                 renderCharts() {
-                    this.renderBalanceChart();
-                    this.renderReturnsChart();
+                    // 防止重复渲染
+                    if (this._renderingCharts) {
+                        console.log('Charts already rendering, skipping...');
+                        return;
+                    }
+                    this._renderingCharts = true;
+
+                    try {
+                        this.renderBalanceChart();
+                        this.renderReturnsChart();
+                    } finally {
+                        // 延迟重置标志，确保渲染完成
+                        setTimeout(() => {
+                            this._renderingCharts = false;
+                        }, 200);
+                    }
                 },
 
                 // 渲染净值曲线图
@@ -1935,6 +1950,12 @@
                         return;
                     }
 
+                    // 检查 canvas 是否可见（offsetParent 不为 null 表示元素可见）
+                    if (!canvas.offsetParent) {
+                        console.warn('balanceChart canvas is not visible');
+                        return;
+                    }
+
                     // 销毁已存在的图表
                     if (this.balanceChart) {
                         this.balanceChart.destroy();
@@ -1943,7 +1964,7 @@
 
                     const ctx = canvas.getContext('2d');
                     if (!ctx) {
-                        console.warn('Cannot get 2d context');
+                        console.warn('Cannot get 2d context for balanceChart');
                         return;
                     }
 
@@ -2038,6 +2059,12 @@
                         return;
                     }
 
+                    // 检查 canvas 是否可见
+                    if (!canvas.offsetParent) {
+                        console.warn('returnsChart canvas is not visible');
+                        return;
+                    }
+
                     // 销毁已存在的图表
                     if (this.returnsChart) {
                         this.returnsChart.destroy();
@@ -2046,7 +2073,7 @@
 
                     const ctx = canvas.getContext('2d');
                     if (!ctx) {
-                        console.warn('Cannot get 2d context');
+                        console.warn('Cannot get 2d context for returnsChart');
                         return;
                     }