diff --git a/examples/range.js b/examples/range.js
index 2cd9a73..25c431f 100644
--- a/examples/range.js
+++ b/examples/range.js
@@ -95,7 +95,7 @@ ReactDOM.render(
     </div>
     <div style={style}>
       <p>Basic Range，`step=20` </p>
-      <Slider range step={20} defaultValue={[20, 40]} onBeforeChange={log} />
+      <Slider range step={20} defaultValue={[20, 20]} onBeforeChange={log} />
     </div>
     <div style={style}>
       <p>Basic Range，`step=20, dots` </p>
diff --git a/src/Slider.jsx b/src/Slider.jsx
index 07ea2d1..22919bc 100644
--- a/src/Slider.jsx
+++ b/src/Slider.jsx
@@ -46,12 +46,7 @@ class Slider extends React.Component {
 
     let recent;
     if (props.range && upperBound === lowerBound) {
-      if (lowerBound === max) {
-        recent = 'lowerBound';
-      }
-      if (upperBound === min) {
-        recent = 'upperBound';
-      }
+      recent = lowerBound === max ? 'lowerBound' : 'upperBound';
     } else {
       recent = 'upperBound';
     }
@@ -240,9 +235,8 @@ class Slider extends React.Component {
     return this.props.vertical ? rect.top : rect.left;
   }
 
-  getPrecision() {
-    const props = this.props;
-    const stepString = props.step.toString();
+  getPrecision(step) {
+    const stepString = step.toString();
     let precision = 0;
     if (stepString.indexOf('.') >= 0) {
       precision = stepString.length - stepString.indexOf('.') - 1;
@@ -282,7 +276,7 @@ class Slider extends React.Component {
     const diffs = points.map((point) => Math.abs(val - point));
     const closestPoint = points[diffs.indexOf(Math.min.apply(Math, diffs))];
 
-    return step !== null ? parseFloat(closestPoint.toFixed(this.getPrecision())) : closestPoint;
+    return step !== null ? parseFloat(closestPoint.toFixed(this.getPrecision(step))) : closestPoint;
   }
 
   calcOffset(value) {
diff --git a/src/Steps.jsx b/src/Steps.jsx
index 5b7a2b5..208f10a 100644
--- a/src/Steps.jsx
+++ b/src/Steps.jsx
@@ -3,7 +3,7 @@ import classNames from 'classnames';
 import warning from 'warning';
 
 function calcPoints(vertical, marks, dots, step, min, max) {
-  warning(dots ? step : true, '`Slider[step]` should be a positive number in order to make Slider[dots] work.');
+  warning(dots ? step > 0 : true, '`Slider[step]` should be a positive number in order to make Slider[dots] work.');
   const points = Object.keys(marks).map(parseFloat);
   if (dots) {
     for (let i = min; i <= max; i = i + step) {