diff --git a/web/models/c_surveysheet_result.go b/web/models/c_surveysheet_result.go
index 08ded1c..7321f98 100644
--- a/web/models/c_surveysheet_result.go
+++ b/web/models/c_surveysheet_result.go
@@ -1039,7 +1039,7 @@ func (c *CSurveysheetResult) Statistic(selectType string) (result StatisticData,
 			} else {
 				data.SatisfactionPercent = utils.Decimal(float64(data.ASum+data.BSum)/float64(data.BuildingSamples), 3)
 			}
-			data.DifferencePercent = utils.Decimal(1-data.SatisfactionPercent, 3)
+			data.DifferencePercent = utils.Decimal(data.SatisfactionPercent-result.Building.SatisfactionPercent, 3)
 			if result.Building.Count == 0 {
 				data.SampleAllPercent = 0
 			} else {
@@ -1146,7 +1146,7 @@ func (c *CSurveysheetResult) Statistic(selectType string) (result StatisticData,
 			} else {
 				data.SatisfactionPercent = utils.Decimal(float64(data.ASum*5+data.BSum*4+data.CSum*3+data.DSum*2+data.ESum*1)/float64(data.BuildingSamples*5), 3)
 			}
-			data.DifferencePercent = utils.Decimal(1-data.SatisfactionPercent, 3)
+			data.DifferencePercent = utils.Decimal(data.SatisfactionPercent-result.Building.SatisfactionPercent, 3)
 			if result.Building.Count == 0 {
 				data.SampleAllPercent = 0
 			} else {