diff --git a/src/component/timeline/TimelineModel.ts b/src/component/timeline/TimelineModel.ts
index a32218acb55e5d98f43b32ba393c83c1dca12412..4598abddbfecc119017122d9428e08d2736754bc 100644
--- a/src/component/timeline/TimelineModel.ts
+++ b/src/component/timeline/TimelineModel.ts
@@ -54,10 +54,10 @@ export interface TimelineControlStyle extends ItemStyleOption {
     nextIcon?: string
 
     // Can be a percent value relative to itemSize
-    playBtnSize: number | string
-    stopBtnSize: number | string
-    nextBtnSize: number | string
-    prevBtnSize: number | string
+    playBtnSize?: number | string
+    stopBtnSize?: number | string
+    nextBtnSize?: number | string
+    prevBtnSize?: number | string
 }
 
 export interface TimelineCheckpointStyle extends ItemStyleOption,
diff --git a/src/component/tooltip/TooltipHTMLContent.ts b/src/component/tooltip/TooltipHTMLContent.ts
index bbdedade3d8f65e5560be30260e784b027f14bc6..a7b5494cb00599e28c1e1313a4d41cdb8dbdc8a5 100644
--- a/src/component/tooltip/TooltipHTMLContent.ts
+++ b/src/component/tooltip/TooltipHTMLContent.ts
@@ -63,6 +63,7 @@ function assembleFont(textStyleModel: Model<TooltipOption['textStyle']>): string
     cssText.push('font:' + textStyleModel.getFont());
 
     fontSize
+        // @ts-ignore, leave it to the tooltip refactor.
         && cssText.push('line-height:' + Math.round(fontSize * 3 / 2) + 'px');
 
     each(['decoration', 'align'] as const, function (name) {
diff --git a/src/label/LabelManager.ts b/src/label/LabelManager.ts
index 12ddbc792f313f76c40311bfc734956f26578f38..1358cd4cc589902765afe996030e57bf442690d2 100644
--- a/src/label/LabelManager.ts
+++ b/src/label/LabelManager.ts
@@ -81,7 +81,7 @@ interface SavedLabelAttr {
         verticalAlign: ZRTextVerticalAlign
         width: number
         height: number
-        fontSize: number
+        fontSize: number | string
 
         x: number
         y: number
diff --git a/src/util/states.ts b/src/util/states.ts
index 085ec6192943646eaa4e28ea0edf508194e3dc9d..4350facdc38f60c6e9ed62a2cdf3f159ff131afc 100644
--- a/src/util/states.ts
+++ b/src/util/states.ts
@@ -188,7 +188,7 @@ function getFromStateStyle(
 function createEmphasisDefaultState(
     el: Displayable,
     stateName: 'emphasis',
-    targetStates?: string[],
+    targetStates: string[],
     state: Displayable['states'][number]
 ) {
     const hasSelect = targetStates && indexOf(targetStates, 'select') >= 0;
diff --git a/src/util/types.ts b/src/util/types.ts
index 8d6ff52d2060b5456fb6d1559f3457ad5acc116c..a723cbf1d5346f63d6c33d3c6761552b75bea80f 100644
--- a/src/util/types.ts
+++ b/src/util/types.ts
@@ -776,7 +776,7 @@ export interface TextCommonOption extends ShadowOptionMixin {
     fontStyle?: ZRFontStyle
     fontWeight?: ZRFontWeight
     fontFamily?: string
-    fontSize?: number
+    fontSize?: number | string
     align?: HorizontalAlign
     verticalAlign?: VerticalAlign
     // @deprecated