diff --git a/business/jxstore/report/report.go b/business/jxstore/report/report.go
index 6ef37efce..b36b631da 100644
--- a/business/jxstore/report/report.go
+++ b/business/jxstore/report/report.go
@@ -471,7 +471,7 @@ func CalculateCoverArea(coordinate []string, vendorID int) (area float64) {
 	}
 	var sum float64
 	for i := 0; i < len(xyList)-1; i++ {
-		sum += (xyList[i+1][0] - xyList[i][0]) * (xyList[i+1][1] + xyList[i+1][1])
+		sum += (xyList[i+1][0] - xyList[i][0]) * (xyList[i+1][1] + xyList[i][1])
 	}
 	sum += (xyList[0][0] - xyList[len(xyList)-1][0]) * (xyList[0][1] + xyList[len(xyList)-1][1])
 	sum /= float64(2)