diff --git a/pkg/coscheduling/coscheduling.go b/pkg/coscheduling/coscheduling.go
index 1dcf8705a..fff7ff292 100644
--- a/pkg/coscheduling/coscheduling.go
+++ b/pkg/coscheduling/coscheduling.go
@@ -28,6 +28,7 @@ import (
 	"k8s.io/client-go/tools/cache"
 	corev1helpers "k8s.io/component-helpers/scheduling/corev1"
 	"k8s.io/klog/v2"
+	v1qos "k8s.io/kubernetes/pkg/apis/core/v1/helper/qos"
 	"k8s.io/kubernetes/pkg/scheduler/framework"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 
@@ -124,14 +125,26 @@ func (cs *Coscheduling) Name() string {
 
 // Less is used to sort pods in the scheduling queue in the following order.
 // 1. Compare the priorities of Pods.
-// 2. Compare the initialization timestamps of PodGroups or Pods.
-// 3. Compare the keys of PodGroups/Pods: <namespace>/<podname>.
+// 2. Compare the Qos of Pods.
+// 3. Compare the initialization timestamps of PodGroups or Pods.
+// 4. Compare the keys of PodGroups/Pods: <namespace>/<podname>.
 func (cs *Coscheduling) Less(podInfo1, podInfo2 *framework.QueuedPodInfo) bool {
 	prio1 := corev1helpers.PodPriority(podInfo1.Pod)
 	prio2 := corev1helpers.PodPriority(podInfo2.Pod)
 	if prio1 != prio2 {
 		return prio1 > prio2
 	}
+
+	if v1qos.GetPodQOS(podInfo1.Pod) != v1qos.GetPodQOS(podInfo2.Pod) {
+		if v1qos.GetPodQOS(podInfo1.Pod) == v1.PodQOSBestEffort {
+			return false
+		}
+		if v1qos.GetPodQOS(podInfo1.Pod) == v1.PodQOSBurstable && v1qos.GetPodQOS(podInfo2.Pod) == v1.PodQOSGuaranteed {
+			return false
+		}
+		return true
+	}
+
 	creationTime1 := cs.pgMgr.GetCreationTimestamp(context.TODO(), podInfo1.Pod, *podInfo1.InitialAttemptTimestamp)
 	creationTime2 := cs.pgMgr.GetCreationTimestamp(context.TODO(), podInfo2.Pod, *podInfo2.InitialAttemptTimestamp)
 	if creationTime1.Equal(creationTime2) {
diff --git a/pkg/coscheduling/coscheduling_test.go b/pkg/coscheduling/coscheduling_test.go
index f0ade5f10..29ab685b9 100644
--- a/pkg/coscheduling/coscheduling_test.go
+++ b/pkg/coscheduling/coscheduling_test.go
@@ -187,6 +187,11 @@ func TestLess(t *testing.T) {
 	lowPriority, highPriority := int32(10), int32(100)
 	now := time.Now()
 
+	capacity := map[v1.ResourceName]string{
+		v1.ResourceCPU:    "25m",
+		v1.ResourceMemory: "100Mi",
+	}
+
 	tests := []struct {
 		name string
 		p1   *framework.QueuedPodInfo
@@ -400,6 +405,56 @@ func TestLess(t *testing.T) {
 			},
 			want: true,
 		},
+		{
+			name: "equal priority, p1.Qos greater than p2.Qos and p2 belong to pg2",
+			p1: &framework.QueuedPodInfo{
+				PodInfo: tu.MustNewPodInfo(t, st.MakePod().Name("p1").Namespace("ns1").Priority(highPriority).
+					Containers(
+						[]v1.Container{
+							st.MakeContainer().Name("p1").ResourceRequests(capacity).ResourceLimits(capacity).Obj(),
+						},
+					).Obj()),
+				InitialAttemptTimestamp: ptrTime(now.Add(time.Second * 1)),
+			},
+			p2: &framework.QueuedPodInfo{
+				PodInfo: tu.MustNewPodInfo(t, st.MakePod().Name("p2").Namespace("ns2").Priority(highPriority).
+					Label(v1alpha1.PodGroupLabel, "pg2").Containers(
+					[]v1.Container{
+						st.MakeContainer().Name("p1").ResourceRequests(capacity).Obj(),
+					},
+				).Obj()),
+				InitialAttemptTimestamp: ptrTime(now.Add(time.Second * 1)),
+			},
+			pgs: []*v1alpha1.PodGroup{
+				tu.MakePodGroup().Name("pg2").Namespace("ns2").Time(now.Add(time.Second * 2)).Obj(),
+			},
+			want: true,
+		},
+		{
+			name: "equal priority, p1.Qos greater than p2.Qos and p1 belongs pg1 and p2 belong to pg2",
+			p1: &framework.QueuedPodInfo{
+				PodInfo: tu.MustNewPodInfo(t, st.MakePod().Name("p1").Namespace("ns1").Priority(highPriority).
+					Label(v1alpha1.PodGroupLabel, "pg1").Containers(
+					[]v1.Container{
+						st.MakeContainer().Name("p1").ResourceRequests(capacity).ResourceLimits(capacity).Obj(),
+					},
+				).Obj()),
+				InitialAttemptTimestamp: ptrTime(now.Add(time.Second * 1)),
+			},
+			p2: &framework.QueuedPodInfo{
+				PodInfo: tu.MustNewPodInfo(t, st.MakePod().Name("p2").Namespace("ns2").Priority(highPriority).
+					Label(v1alpha1.PodGroupLabel, "pg2").Containers(
+					[]v1.Container{
+						st.MakeContainer().Name("p2").Obj(),
+					},
+				).Obj()),
+				InitialAttemptTimestamp: ptrTime(now.Add(time.Second * 1)),
+			},
+			pgs: []*v1alpha1.PodGroup{
+				tu.MakePodGroup().Name("pg1").Namespace("ns1").Time(now.Add(time.Second * 1)).Obj(),
+				tu.MakePodGroup().Name("pg2").Namespace("ns2").Time(now.Add(time.Second * 2)).Obj()},
+			want: true,
+		},
 	}
 
 	for _, tt := range tests {