diff --git a/core/core-frontend/src/models/chart/chart-style.d.ts b/core/core-frontend/src/models/chart/chart-style.d.ts
index f48e097cdb..24c288e67b 100644
--- a/core/core-frontend/src/models/chart/chart-style.d.ts
+++ b/core/core-frontend/src/models/chart/chart-style.d.ts
@@ -43,7 +43,7 @@ declare interface ChartTextStyle {
   /**
    * 字体大小
    */
-  fontSize: string
+  fontSize: number
   /**
    * 颜色
    */
diff --git a/core/core-frontend/src/views/chart/components/editor/util/chart.ts b/core/core-frontend/src/views/chart/components/editor/util/chart.ts
index 75b406991e..7deaff1404 100644
--- a/core/core-frontend/src/views/chart/components/editor/util/chart.ts
+++ b/core/core-frontend/src/views/chart/components/editor/util/chart.ts
@@ -333,7 +333,7 @@ export const DEFAULT_TABLE_CELL: ChartTableCellAttr = {
 }
 export const DEFAULT_TITLE_STYLE: ChartTextStyle = {
   show: true,
-  fontSize: '18',
+  fontSize: 16,
   color: '#ffffff',
   hPosition: 'left',
   vPosition: 'top',
@@ -349,7 +349,7 @@ export const DEFAULT_TITLE_STYLE: ChartTextStyle = {
 
 export const DEFAULT_TITLE_STYLE_BASE: ChartTextStyle = {
   show: true,
-  fontSize: '18',
+  fontSize: 16,
   hPosition: 'left',
   vPosition: 'top',
   isItalic: false,