diff --git a/frontend/src/views/chart/chart/chart.js b/frontend/src/views/chart/chart/chart.js
index 0d0da8969c..bd9461dfb3 100644
--- a/frontend/src/views/chart/chart/chart.js
+++ b/frontend/src/views/chart/chart/chart.js
@@ -64,12 +64,12 @@ export const DEFAULT_SIZE = {
   quotaFontFamily: 'Microsoft YaHei',
   quotaFontIsBolder: false,
   quotaFontIsItalic: false,
-  quotaLetterSpace: 0,
+  quotaLetterSpace: '0',
   quotaFontShadow: false,
   dimensionFontFamily: 'Microsoft YaHei',
   dimensionFontIsBolder: false,
   dimensionFontIsItalic: false,
-  dimensionLetterSpace: 0,
+  dimensionLetterSpace: '0',
   dimensionFontShadow: false,
   scatterSymbol: 'circle',
   scatterSymbolSize: 20,