diff --git a/web/templates/index.html b/web/templates/index.html
index 9728699..3e8ae21 100644
--- a/web/templates/index.html
+++ b/web/templates/index.html
@@ -3891,19 +3891,37 @@
                     }
                     
                     // 添加所有笔到图表
-                    biLines.forEach(line => {
-                        const lineSeries = mainChart.addLineSeries({
-                            color: line.color,
-                            lineWidth: line.lineWidth,
-                            lineStyle: line.lineStyle || 0,  // 支持虚线样式
-                            lastValueVisible: false,
-                            priceLineVisible: false,
-                        });
-                        
-                        lineSeries.setData([
-                            { time: line.startTime, value: line.startPrice },
-                            { time: line.endTime, value: line.endPrice }
-                        ]);
+                    // 1m 等小周期叠加到大周期时，笔数量会非常大；每条笔创建一个 series 会导致主图渲染退化
+                    // 这里限制绘制数量，优先保留最新笔，避免把主K线和其他元素“挤没”
+                    const MAX_BI_LINE_SERIES = 800;
+                    if (biLines.length > MAX_BI_LINE_SERIES) {
+                        console.warn(`BI线条过多(${biLines.length})，仅绘制最新 ${MAX_BI_LINE_SERIES} 条以保障主图稳定`);
+                    }
+                    const linesToDraw = biLines.length > MAX_BI_LINE_SERIES
+                        ? biLines.slice(-MAX_BI_LINE_SERIES)
+                        : biLines;
+
+                    linesToDraw.forEach(line => {
+                        try {
+                            if (!Number.isFinite(line.startTime) || !Number.isFinite(line.endTime)) return;
+                            if (!Number.isFinite(line.startPrice) || !Number.isFinite(line.endPrice)) return;
+                            if (line.endTime <= line.startTime) return;
+
+                            const lineSeries = mainChart.addLineSeries({
+                                color: line.color,
+                                lineWidth: line.lineWidth,
+                                lineStyle: line.lineStyle || 0,  // 支持虚线样式
+                                lastValueVisible: false,
+                                priceLineVisible: false,
+                            });
+
+                            lineSeries.setData([
+                                { time: line.startTime, value: line.startPrice },
+                                { time: line.endTime, value: line.endPrice }
+                            ]);
+                        } catch (e) {
+                            console.warn('绘制BI线段失败，已跳过单条异常数据:', e);
+                        }
                     });
                 } else {
                     console.log('绘制笔 - 已禁用');