diff --git a/LifeLog/LifeLog/HistoryViewController.m b/LifeLog/LifeLog/HistoryViewController.m
index 3988b43..a3e38f5 100644
--- a/LifeLog/LifeLog/HistoryViewController.m
+++ b/LifeLog/LifeLog/HistoryViewController.m
@@ -139,14 +139,55 @@
     {
         set1 = (BarChartDataSet *)self.viewBarChart.data.dataSets[0];
         set1.values = yVals;
+        
+        NSMutableArray *color = [[NSMutableArray alloc] init];
+        for(int i = 0; i < yVals.count; i++) {
+            BarChartDataEntry *en = yVals[i];
+            if(obj.step != 0) {
+                double percent = en.y / obj.step * 100;
+                if(percent > 80) {
+                    [color addObject:[UIColor redColor]];
+                }
+                else if(percent > 60) {
+                    [color addObject:[UIColor yellowColor]];
+                }
+                else {
+                    [color addObject:[UIColor whiteColor]];
+                }
+            }
+            else {
+                [color addObject:[UIColor whiteColor]];
+            }
+        }
+        [set1 setColors:color];
+        
         [self.viewBarChart.data notifyDataChanged];
         [self.viewBarChart notifyDataSetChanged];
     }
     else
     {
         set1 = [[BarChartDataSet alloc] initWithValues:yVals label:@""];
-        [set1 setColor:[UIColor whiteColor]];
         
+        NSMutableArray *color = [[NSMutableArray alloc] init];
+        for(int i = 0; i < yVals.count; i++) {
+            BarChartDataEntry *en = yVals[i];
+            if(obj.step != 0) {
+                double percent = en.y / obj.step * 100;
+                if(percent > 80) {
+                    [color addObject:[UIColor redColor]];
+                }
+                else if(percent > 60) {
+                    [color addObject:[UIColor yellowColor]];
+                }
+                else {
+                    [color addObject:[UIColor whiteColor]];
+                }
+            }
+            else {
+                [color addObject:[UIColor whiteColor]];
+            }
+        }
+        [set1 setColors:color];
         NSMutableArray *dataSets = [[NSMutableArray alloc] init];
         [dataSets addObject:set1];