diff --git a/src/chart/line/LineView.ts b/src/chart/line/LineView.ts
index c0979a3f71f3b6f077038df45795da682248cc90..5534f70c2818877e86ad81964f1e153d515ee22d 100644
--- a/src/chart/line/LineView.ts
+++ b/src/chart/line/LineView.ts
@@ -553,7 +553,7 @@ class LineView extends ChartView {
         const shouldBolderOnEmphasis = seriesModel.get(['emphasis', 'lineStyle', 'width']) === 'bolder';
         if (shouldBolderOnEmphasis) {
             const emphasisLineStyle = polyline.getState('emphasis').style;
-            emphasisLineStyle.lineWidth = lineStyleModel.get('width') + 1;
+            emphasisLineStyle.lineWidth = polyline.style.lineWidth + 1;
         }
 
         // Needs seriesIndex for focus