diff --git a/ZFChartView/ZFChartView/ZFChart/ZFLineChart/ZFLineChart.m b/ZFChartView/ZFChartView/ZFChart/ZFLineChart/ZFLineChart.m
index 6c3068f..21c9c20 100644
--- a/ZFChartView/ZFChartView/ZFChart/ZFLineChart/ZFLineChart.m
+++ b/ZFChartView/ZFChartView/ZFChart/ZFLineChart/ZFLineChart.m
@@ -78,7 +78,10 @@ - (void)drawCircle{
     if ([subObject isKindOfClass:[NSString class]]) {
         for (NSInteger i = 0; i < self.genericAxis.xLineValueArray.count; i++) {
             BOOL isOverrun = NO;//记录是否超出上限
-            CGFloat percent = ([self.genericAxis.xLineValueArray[i] floatValue] - self.genericAxis.yLineMinValue) / (self.genericAxis.yLineMaxValue - self.genericAxis.yLineMinValue);
+            CGFloat percent = 0;
+            if(self.genericAxis.yLineMaxValue - self.genericAxis.yLineMinValue != 0){
+                percent = ([self.genericAxis.xLineValueArray[i] floatValue] - self.genericAxis.yLineMinValue) / (self.genericAxis.yLineMaxValue - self.genericAxis.yLineMinValue);
+            }
             if (percent > 1) {
                 percent = 1.f;
                 isOverrun = YES;
@@ -112,7 +115,11 @@ - (void)drawCircle{
                 //第几个圆
                 for (NSInteger circleIndex = 0; circleIndex < [subObject count]; circleIndex++) {
                     BOOL isOverrun = NO;//记录是否超出上限
-                    CGFloat percent = ([self.genericAxis.xLineValueArray[lineIndex][circleIndex] floatValue] - self.genericAxis.yLineMinValue) / (self.genericAxis.yLineMaxValue - self.genericAxis.yLineMinValue);
+                    CGFloat percent = 0;
+                    if(self.genericAxis.yLineMaxValue - self.genericAxis.yLineMinValue != 0){
+                        percent = ([self.genericAxis.xLineValueArray[lineIndex][circleIndex] floatValue] - self.genericAxis.yLineMinValue) / (self.genericAxis.yLineMaxValue - self.genericAxis.yLineMinValue);
+                    }
+                    
                     if (percent > 1) {
                         percent = 1.f;
                         isOverrun = YES;