diff --git a/manager/searcher/searcher.go b/manager/searcher/searcher.go
index bbb243c5c71..17592706379 100644
--- a/manager/searcher/searcher.go
+++ b/manager/searcher/searcher.go
@@ -192,7 +192,7 @@ func calculateIDCAffinityScore(dst, src string) float64 {
 		return minScore
 	}
 
-	if dst == src {
+	if strings.EqualFold(dst, src) {
 		return maxScore
 	}
 
@@ -201,7 +201,7 @@ func calculateIDCAffinityScore(dst, src string) float64 {
 	// it gets the max score of idc.
 	srcElements := strings.Split(src, types.AffinitySeparator)
 	for _, srcElement := range srcElements {
-		if dst == srcElement {
+		if strings.EqualFold(dst, srcElement) {
 			return maxScore
 		}
 	}
@@ -215,7 +215,7 @@ func calculateMultiElementAffinityScore(dst, src string) float64 {
 		return minScore
 	}
 
-	if dst == src {
+	if strings.EqualFold(dst, src) {
 		return maxScore
 	}
 
@@ -231,7 +231,7 @@ func calculateMultiElementAffinityScore(dst, src string) float64 {
 	}
 
 	for i := 0; i < elementLen; i++ {
-		if dstElements[i] != srcElements[i] {
+		if !strings.EqualFold(dstElements[i], srcElements[i]) {
 			break
 		}
 
diff --git a/manager/searcher/searcher_test.go b/manager/searcher/searcher_test.go
index 2297794a3b9..e5b00bd75d8 100644
--- a/manager/searcher/searcher_test.go
+++ b/manager/searcher/searcher_test.go
@@ -371,11 +371,11 @@ func TestSearcher_FindSchedulerClusters(t *testing.T) {
 			},
 			expect: func(t *testing.T, data []models.SchedulerCluster, err error) {
 				assert := assert.New(t)
-				assert.Equal(data[0].Name, "bax")
-				assert.Equal(data[1].Name, "bae")
-				assert.Equal(data[2].Name, "foo")
-				assert.Equal(data[3].Name, "bar")
-				assert.Equal(data[4].Name, "baz")
+				assert.Equal(data[0].Name, "baz")
+				assert.Equal(data[1].Name, "bar")
+				assert.Equal(data[2].Name, "bax")
+				assert.Equal(data[3].Name, "bae")
+				assert.Equal(data[4].Name, "foo")
 				assert.Equal(data[5].Name, "bac")
 				assert.Equal(data[6].Name, "bat")
 				assert.Equal(len(data), 7)
diff --git a/scheduler/scheduling/evaluator/evaluator_base.go b/scheduler/scheduling/evaluator/evaluator_base.go
index f6a72efd542..9016cdb4900 100644
--- a/scheduler/scheduling/evaluator/evaluator_base.go
+++ b/scheduler/scheduling/evaluator/evaluator_base.go
@@ -152,7 +152,11 @@ func calculateHostTypeScore(peer *resource.Peer) float64 {
 
 // calculateIDCAffinityScore 0.0~1.0 larger and better.
 func calculateIDCAffinityScore(dst, src string) float64 {
-	if dst != "" && src != "" && dst == src {
+	if dst == "" || src == "" {
+		return minScore
+	}
+
+	if strings.EqualFold(dst, src) {
 		return maxScore
 	}
 
@@ -165,7 +169,7 @@ func calculateMultiElementAffinityScore(dst, src string) float64 {
 		return minScore
 	}
 
-	if dst == src {
+	if strings.EqualFold(dst, src) {
 		return maxScore
 	}
 
@@ -181,9 +185,10 @@ func calculateMultiElementAffinityScore(dst, src string) float64 {
 	}
 
 	for i := 0; i < elementLen; i++ {
-		if dstElements[i] != srcElements[i] {
+		if !strings.EqualFold(dstElements[i], srcElements[i]) {
 			break
 		}
+
 		score++
 	}