diff --git a/components/core/util/number.ts b/components/core/util/number.ts
index 946f97d832f..28ed8836902 100644
--- a/components/core/util/number.ts
+++ b/components/core/util/number.ts
@@ -12,6 +12,7 @@ export function ensureNumberInRange(num: number, min: number, max: number): numb
   if (isNaN(num) || num < min) {
     return min;
   } else if (num > max) {
+    console.log('captured max');
     return max;
   } else {
     return num;
diff --git a/components/slider/nz-slider-error.ts b/components/slider/nz-slider-error.ts
index 542146ec961..e8e7f558dc7 100644
--- a/components/slider/nz-slider-error.ts
+++ b/components/slider/nz-slider-error.ts
@@ -1,7 +1,3 @@
 export function getValueTypeNotMatchError(): Error {
   return new Error(`The "nzRange" can't match the "nzValue"'s type, please check these properties: "nzRange", "nzValue", "nzDefaultValue".`);
 }
-
-export function getValueTypeNotLegalError(): Error {
-  return new Error(``);
-}
\ No newline at end of file
diff --git a/components/slider/nz-slider.component.ts b/components/slider/nz-slider.component.ts
index 3e34b3b423b..99bbb5e29af 100644
--- a/components/slider/nz-slider.component.ts
+++ b/components/slider/nz-slider.component.ts
@@ -124,6 +124,11 @@ export class NzSliderComponent implements ControlValueAccessor, OnInit, OnChange
     this.onTouched = fn;
   }
 
+  setDisabledState(isDisabled: boolean): void {
+    this.nzDisabled = isDisabled;
+    this.toggleDragDisabled(isDisabled);
+  }
+
   private setValue(value: SliderValue, isWriteValue: boolean = false): void {
     if (isWriteValue) {
       this.value = this.formatValue(value);
@@ -204,6 +209,8 @@ export class NzSliderComponent implements ControlValueAccessor, OnInit, OnChange
     });
     [ this.bounds.lower, this.bounds.upper ] = boundParts;
     [ this.track.offset, this.track.length ] = trackParts;
+
+    this.cdr.markForCheck();
   }
 
   private onDragStart(value: number): void {
diff --git a/components/slider/nz-slider.spec.ts b/components/slider/nz-slider.spec.ts
index 6070a0feb35..7dbee82bc58 100644
--- a/components/slider/nz-slider.spec.ts
+++ b/components/slider/nz-slider.spec.ts
@@ -123,10 +123,6 @@ describe('NzSlider', () => {
       expect(onChangeSpy).toHaveBeenCalledTimes(1);
     });
 
-    it('should pass un-covered code testing', () => {
-      expect(sliderInstance.getValueToOffset()).toBe(sliderInstance.value);
-    });
-
     it('should always display tooltip work', () => {
 
     });