diff --git a/pkg/scheduler/api/job_info.go b/pkg/scheduler/api/job_info.go
index e219ed1b0e9..a56fac6b647 100644
--- a/pkg/scheduler/api/job_info.go
+++ b/pkg/scheduler/api/job_info.go
@@ -492,30 +492,11 @@ func (ji *JobInfo) GetMinResources() *Resource {
 
 // GetElasticResources returns those partly resources in allocated which are more than its minResource
 func (ji *JobInfo) GetElasticResources() *Resource {
-	elastic := EmptyResource()
 	if ji.Allocated == nil {
-		return elastic
+		return EmptyResource()
 	}
 	minResource := ji.GetMinResources()
-	if ji.Allocated.MilliCPU > minResource.MilliCPU {
-		elastic.MilliCPU = ji.Allocated.MilliCPU - minResource.MilliCPU
-	}
-	if ji.Allocated.Memory > minResource.Memory {
-		elastic.Memory = ji.Allocated.Memory - minResource.Memory
-	}
-
-	for k, v := range ji.Allocated.ScalarResources {
-		if k == v1.ResourcePods{
-			continue
-		}
-		minv := minResource.ScalarResources[k]
-		if v > minv {
-			if elastic.ScalarResources == nil {
-				elastic.ScalarResources = map[v1.ResourceName]float64{}
-			}
-			elastic.ScalarResources[k] = v - minv
-		}
-	}
+	elastic := ExceedPart(ji.Allocated, minResource)
 
 	return elastic
 }
diff --git a/pkg/scheduler/api/resource_info.go b/pkg/scheduler/api/resource_info.go
index d732fafcaaf..f6964df2885 100644
--- a/pkg/scheduler/api/resource_info.go
+++ b/pkg/scheduler/api/resource_info.go
@@ -709,3 +709,34 @@ func (r ResourceNameList) Contains(rr ResourceNameList) bool {
 func IsCountQuota(name v1.ResourceName) bool {
 	return strings.HasPrefix(string(name), "count/")
 }
+
+// ExceedPart returns the partly resource in left which exceed right
+func ExceedPart(left, right *Resource) *Resource {
+	if right == nil {
+		return left
+	}
+	diff := EmptyResource()
+	if left == nil {
+		return diff
+	}
+	if left.MilliCPU > right.MilliCPU {
+		diff.MilliCPU = left.MilliCPU - right.MilliCPU
+	}
+	if left.Memory > right.Memory {
+		diff.Memory = left.Memory - right.Memory
+	}
+
+	for k, v := range left.ScalarResources {
+		if k == v1.ResourcePods {
+			continue
+		}
+		minv := right.ScalarResources[k]
+		if v > minv {
+			if diff.ScalarResources == nil {
+				diff.ScalarResources = map[v1.ResourceName]float64{}
+			}
+			diff.ScalarResources[k] = v - minv
+		}
+	}
+	return diff
+}
diff --git a/pkg/scheduler/plugins/proportion/proportion.go b/pkg/scheduler/plugins/proportion/proportion.go
index 5baf64a7f5f..916f7a21537 100644
--- a/pkg/scheduler/plugins/proportion/proportion.go
+++ b/pkg/scheduler/plugins/proportion/proportion.go
@@ -117,7 +117,7 @@ func (pp *proportionPlugin) OnSessionOpen(ssn *framework.Session) {
 			if len(queue.Queue.Spec.Guarantee.Resource) != 0 {
 				attr.guarantee = api.NewResource(queue.Queue.Spec.Guarantee.Resource)
 			}
-			realCapability := pp.totalResource.Clone().Sub(pp.totalGuarantee).Add(attr.guarantee)
+			realCapability := api.ExceedPart(pp.totalResource, pp.totalGuarantee).Add(attr.guarantee)
 			if attr.capability == nil {
 				attr.realCapability = realCapability
 			} else {