diff --git a/packages/slider/src/button.vue b/packages/slider/src/button.vue
index 128602c4c..a77dfd7a9 100644
--- a/packages/slider/src/button.vue
+++ b/packages/slider/src/button.vue
@@ -138,6 +138,7 @@
       onDragging(event) {
         if (this.dragging) {
           this.displayTooltip();
+          this.$parent.resetSize();
           let diff = 0;
           if (this.vertical) {
             this.currentY = event.clientY;
diff --git a/packages/slider/src/main.vue b/packages/slider/src/main.vue
index 23ff3c695..07a2fed63 100644
--- a/packages/slider/src/main.vue
+++ b/packages/slider/src/main.vue
@@ -221,6 +221,7 @@
 
       onSliderClick(event) {
         if (this.disabled || this.dragging) return;
+        this.resetSize();
         if (this.vertical) {
           const sliderOffsetBottom = this.$refs.slider.getBoundingClientRect().bottom;
           this.setPosition((sliderOffsetBottom - event.clientY) / this.sliderSize * 100);