diff --git a/pkg/scheduler/api/resource_info.go b/pkg/scheduler/api/resource_info.go
index 3f69b102bf..7101ec82a3 100644
--- a/pkg/scheduler/api/resource_info.go
+++ b/pkg/scheduler/api/resource_info.go
@@ -437,38 +437,42 @@ func (r *Resource) Equal(rr *Resource, defaultValue DimensionDefaultValue) bool
 }
 
 // Diff calculate the difference between two resource object
-func (r *Resource) Diff(rr *Resource) (*Resource, *Resource) {
+// Note: if `defaultValue` equals `Infinity`, the difference between two values will be `Infinity`, marked as -1
+func (r *Resource) Diff(rr *Resource, defaultValue DimensionDefaultValue) (*Resource, *Resource) {
+	leftRes := r.Clone()
+	rightRes := rr.Clone()
 	increasedVal := EmptyResource()
 	decreasedVal := EmptyResource()
-	if r.MilliCPU > rr.MilliCPU {
-		increasedVal.MilliCPU += r.MilliCPU - rr.MilliCPU
+	r.setDefaultValue(leftRes, rightRes, defaultValue)
+
+	if leftRes.MilliCPU > rightRes.MilliCPU {
+		increasedVal.MilliCPU = leftRes.MilliCPU - rightRes.MilliCPU
 	} else {
-		decreasedVal.MilliCPU += rr.MilliCPU - r.MilliCPU
+		decreasedVal.MilliCPU = rightRes.MilliCPU - leftRes.MilliCPU
 	}
 
-	if r.Memory > rr.Memory {
-		increasedVal.Memory += r.Memory - rr.Memory
+	if leftRes.Memory > rightRes.Memory {
+		increasedVal.Memory = leftRes.Memory - rightRes.Memory
 	} else {
-		decreasedVal.Memory += rr.Memory - r.Memory
+		decreasedVal.Memory = rightRes.Memory - leftRes.Memory
 	}
 
-	for rName, rQuant := range r.ScalarResources {
-		rrQuant, ok := rr.ScalarResources[rName]
-
-		if !ok {
-			rrQuant = 0
+	increasedVal.ScalarResources = make(map[v1.ResourceName]float64, 0)
+	decreasedVal.ScalarResources = make(map[v1.ResourceName]float64, 0)
+	for lName, lQuant := range leftRes.ScalarResources {
+		rQuant, _ := rightRes.ScalarResources[lName]
+		if lQuant == -1 {
+			increasedVal.ScalarResources[lName] = -1
+			continue
 		}
-
-		if rQuant > rrQuant {
-			if increasedVal.ScalarResources == nil {
-				increasedVal.ScalarResources = map[v1.ResourceName]float64{}
-			}
-			increasedVal.ScalarResources[rName] += rQuant - rrQuant
+		if rQuant == -1 {
+			decreasedVal.ScalarResources[lName] = -1
+			continue
+		}
+		if lQuant > rQuant {
+			increasedVal.ScalarResources[lName] = lQuant - rQuant
 		} else {
-			if decreasedVal.ScalarResources == nil {
-				decreasedVal.ScalarResources = map[v1.ResourceName]float64{}
-			}
-			decreasedVal.ScalarResources[rName] += rrQuant - rQuant
+			decreasedVal.ScalarResources[lName] = rQuant - lQuant
 		}
 	}
 
diff --git a/pkg/scheduler/api/resource_info_test.go b/pkg/scheduler/api/resource_info_test.go
index bc17d20ed6..4b3fb1402d 100644
--- a/pkg/scheduler/api/resource_info_test.go
+++ b/pkg/scheduler/api/resource_info_test.go
@@ -289,6 +289,179 @@ func TestSubResource(t *testing.T) {
 	}
 }
 
+func TestDiff(t *testing.T) {
+	testsForDefaultZero := []struct {
+		resource1         *Resource
+		resource2         *Resource
+		expectedIncreased *Resource
+		expectedDecreased *Resource
+	}{
+		{
+			resource1: &Resource{},
+			resource2: &Resource{},
+			expectedIncreased: &Resource{
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+			expectedDecreased: &Resource{
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+		},
+		{
+			resource1: &Resource{
+				MilliCPU: 1000,
+				Memory:   2000,
+			},
+			resource2: &Resource{},
+			expectedIncreased: &Resource{
+				MilliCPU:        1000,
+				Memory:          2000,
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+			expectedDecreased: &Resource{
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+		},
+		{
+			resource1: &Resource{},
+			resource2: &Resource{
+				MilliCPU: 1000,
+				Memory:   2000,
+			},
+			expectedIncreased: &Resource{
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+			expectedDecreased: &Resource{
+				MilliCPU:        1000,
+				Memory:          2000,
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+		},
+		{
+			resource1: &Resource{
+				MilliCPU:        1000,
+				Memory:          2000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 1000},
+			},
+			resource2: &Resource{
+				MilliCPU: 2000,
+				Memory:   1000,
+			},
+			expectedIncreased: &Resource{
+				Memory:          1000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 1000},
+			},
+			expectedDecreased: &Resource{
+				MilliCPU:        1000,
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+		},
+		{
+			resource1: &Resource{
+				MilliCPU: 2000,
+				Memory:   1000,
+			},
+			resource2: &Resource{
+				MilliCPU:        1000,
+				Memory:          2000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 1000},
+			},
+			expectedIncreased: &Resource{
+				MilliCPU:        1000,
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+			expectedDecreased: &Resource{
+				Memory:          1000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 1000},
+			},
+		},
+		{
+			resource1: &Resource{
+				MilliCPU:        1000,
+				Memory:          2000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 3000},
+			},
+			resource2: &Resource{
+				MilliCPU:        2000,
+				Memory:          1000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 1000},
+			},
+			expectedIncreased: &Resource{
+				Memory:          1000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 2000},
+			},
+			expectedDecreased: &Resource{
+				MilliCPU:        1000,
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+		},
+	}
+
+	testsForDefaultInfinity := []struct {
+		resource1         *Resource
+		resource2         *Resource
+		expectedIncreased *Resource
+		expectedDecreased *Resource
+	}{
+		{
+			resource1: &Resource{
+				MilliCPU:        1000,
+				Memory:          2000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 1000},
+			},
+			resource2: &Resource{
+				MilliCPU: 2000,
+				Memory:   1000,
+			},
+			expectedIncreased: &Resource{
+				Memory:          1000,
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+			expectedDecreased: &Resource{
+				MilliCPU:        1000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": -1},
+			},
+		},
+		{
+			resource1: &Resource{
+				MilliCPU: 2000,
+				Memory:   1000,
+			},
+			resource2: &Resource{
+				MilliCPU:        1000,
+				Memory:          2000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": 1000},
+			},
+			expectedIncreased: &Resource{
+				MilliCPU:        1000,
+				ScalarResources: map[v1.ResourceName]float64{"scalar.test/scalar1": -1},
+			},
+			expectedDecreased: &Resource{
+				Memory:          1000,
+				ScalarResources: make(map[v1.ResourceName]float64, 0),
+			},
+		},
+	}
+
+	for _, test := range testsForDefaultZero {
+		increased, decreased := test.resource1.Diff(test.resource2, Zero)
+		if !reflect.DeepEqual(test.expectedIncreased, increased) {
+			t.Errorf("expected: %#v, got: %#v", test.expectedIncreased, increased)
+		}
+		if !reflect.DeepEqual(test.expectedDecreased, decreased) {
+			t.Errorf("expected: %#v, got: %#v", test.expectedDecreased, decreased)
+		}
+	}
+	for _, test := range testsForDefaultInfinity {
+		increased, decreased := test.resource1.Diff(test.resource2, Infinity)
+		if !reflect.DeepEqual(test.expectedIncreased, increased) {
+			t.Errorf("expected: %#v, got: %#v", test.expectedIncreased, increased)
+		}
+		if !reflect.DeepEqual(test.expectedDecreased, decreased) {
+			t.Errorf("expected: %#v, got: %#v", test.expectedDecreased, decreased)
+		}
+	}
+}
+
 func TestLess(t *testing.T) {
 	testsForDefaultZero := []struct {
 		resource1 *Resource
diff --git a/pkg/scheduler/plugins/proportion/proportion.go b/pkg/scheduler/plugins/proportion/proportion.go
index 17b988acdb..984bb0900d 100644
--- a/pkg/scheduler/plugins/proportion/proportion.go
+++ b/pkg/scheduler/plugins/proportion/proportion.go
@@ -178,7 +178,7 @@ func (pp *proportionPlugin) OnSessionOpen(ssn *framework.Session) {
 			klog.V(4).Infof("The attributes of queue <%s> in proportion: deserved <%v>, allocate <%v>, request <%v>, share <%0.2f>",
 				attr.name, attr.deserved, attr.allocated, attr.request, attr.share)
 
-			increased, decreased := attr.deserved.Diff(oldDeserved)
+			increased, decreased := attr.deserved.Diff(oldDeserved, api.Zero)
 			increasedDeserved.Add(increased)
 			decreasedDeserved.Add(decreased)
 
@@ -254,7 +254,7 @@ func (pp *proportionPlugin) OnSessionOpen(ssn *framework.Session) {
 		underUsedResNames := api.ResourceNameList{}
 		attr := pp.queueOpts[queue.UID]
 
-		_, underUsedResource := attr.allocated.Diff(attr.deserved)
+		_, underUsedResource := attr.allocated.Diff(attr.deserved, api.Zero)
 		if underUsedResource.MilliCPU >= api.GetMinResource() {
 			underUsedResNames = append(underUsedResNames, v1.ResourceCPU)
 		}
@@ -268,7 +268,6 @@ func (pp *proportionPlugin) OnSessionOpen(ssn *framework.Session) {
 			queue.Name, attr.deserved, attr.allocated, attr.share, underUsedResNames)
 
 		return underUsedResNames
-
 	})
 
 	ssn.AddJobEnqueueableFn(pp.Name(), func(obj interface{}) int {