diff --git a/src/views/waveformPreviewContent.ts b/src/views/waveformPreviewContent.ts
index 6c98a77..9e20df4 100644
--- a/src/views/waveformPreviewContent.ts
+++ b/src/views/waveformPreviewContent.ts
@@ -263,61 +263,63 @@ export function getWaveformPreviewScript(): string {
         const timeRange = maxTime - minTime || 1;
 
         // 绘制波形
-        let pathData = '';
-        let lastX = leftMargin;
-        let lastValue = signal.values[0].value;
+        if (signal.width === 1) {
+          // 单比特信号 - 绘制数字波形
+          let pathData = '';
+          const yHigh = y;
+          const yLow = y + signalHeight;
 
-        signal.values.forEach((point, i) => {
-          const x = leftMargin + ((point.time - minTime) / timeRange) * waveformWidth;
-          const value = point.value;
-
-          if (signal.width === 1) {
-            // 单比特信号 - 绘制数字波形
-            const yHigh = y;
-            const yLow = y + signalHeight;
-            const currentY = (value === '1') ? yHigh : yLow;
+          signal.values.forEach((point, i) => {
+            const x = leftMargin + ((point.time - minTime) / timeRange) * waveformWidth;
+            const currentY = (point.value === '1') ? yHigh : yLow;
 
             if (i === 0) {
               pathData = \`M \${x} \${currentY}\`;
             } else {
-              // 绘制垂直跳变
-              const prevY = (lastValue === '1') ? yHigh : yLow;
+              const prevValue = signal.values[i - 1].value;
+              const prevY = (prevValue === '1') ? yHigh : yLow;
               if (prevY !== currentY) {
                 pathData += \` L \${x} \${prevY} L \${x} \${currentY}\`;
               } else {
                 pathData += \` L \${x} \${currentY}\`;
               }
             }
+          });
 
-            lastValue = value;
-            lastX = x;
-          } else {
-            // 多比特信号 - 绘制总线波形（梯形）
-            const yTop = y + 5;
-            const yBottom = y + signalHeight - 5;
-            const transitionWidth = 5;
-
-            if (i === 0) {
-              pathData = \`M \${x} \${yTop + (yBottom - yTop) / 2}\`;
-            } else {
-              // 绘制梯形过渡
-              pathData += \` L \${x - transitionWidth} \${yTop} L \${x} \${yTop + (yBottom - yTop) / 2}\`;
-            }
-
-            lastX = x;
-          }
-        });
-
-        // 延伸到右边界
-        if (signal.width === 1) {
-          const lastY = (lastValue === '1') ? y : (y + signalHeight);
+          // 延伸到右边界
+          const lastValue = signal.values[signal.values.length - 1].value;
+          const lastY = (lastValue === '1') ? yHigh : yLow;
           pathData += \` L \${leftMargin + waveformWidth} \${lastY}\`;
-        } else {
-          const yMid = y + signalHeight / 2;
-          pathData += \` L \${leftMargin + waveformWidth} \${yMid}\`;
-        }
 
-        svgContent += \`<path d="\${pathData}" stroke="\${color}" stroke-width="1.5" fill="none"/>\`;
+          svgContent += \`<path d="\${pathData}" stroke="\${color}" stroke-width="1.5" fill="none"/>\`;
+        } else {
+          // 多比特信号 - 绘制总线波形（上下双线）
+          const yTop = y + 5;
+          const yBottom = y + signalHeight - 5;
+          const transitionWidth = 4;
+
+          let topPath = \`M \${leftMargin} \${yTop}\`;
+          let bottomPath = \`M \${leftMargin} \${yBottom}\`;
+
+          signal.values.forEach((point, i) => {
+            const x = leftMargin + ((point.time - minTime) / timeRange) * waveformWidth;
+
+            // 上线和下线都延伸到变化点
+            topPath += \` L \${x} \${yTop}\`;
+            bottomPath += \` L \${x} \${yBottom}\`;
+
+            // 绘制梯形过渡
+            topPath += \` L \${x + transitionWidth} \${yBottom} L \${x + transitionWidth} \${yTop}\`;
+            bottomPath += \` L \${x + transitionWidth} \${yTop} L \${x + transitionWidth} \${yBottom}\`;
+          });
+
+          // 延伸到右边界
+          topPath += \` L \${leftMargin + waveformWidth} \${yTop}\`;
+          bottomPath += \` L \${leftMargin + waveformWidth} \${yBottom}\`;
+
+          svgContent += \`<path d="\${topPath}" stroke="\${color}" stroke-width="1.5" fill="none"/>\`;
+          svgContent += \`<path d="\${bottomPath}" stroke="\${color}" stroke-width="1.5" fill="none"/>\`;
+        }
       });
 
       // 绘制时间轴