diff --git a/pkg/scheduler/plugins/loadaware/helper.go b/pkg/scheduler/plugins/loadaware/helper.go
index 788c27e87..f0fa0131b 100644
--- a/pkg/scheduler/plugins/loadaware/helper.go
+++ b/pkg/scheduler/plugins/loadaware/helper.go
@@ -60,20 +60,26 @@ func getTargetAggregatedUsage(nodeMetric *slov1alpha1.NodeMetric, aggregatedDura
 		return nil
 	}
 
-	// If no specific period is set, the maximum period recorded by NodeMetrics will be used by default.
+	// If no specific period is set, the non-empty maximum period recorded by NodeMetrics will be used by default.
 	// This is a default policy.
 	if aggregatedDuration == nil || aggregatedDuration.Duration == 0 {
 		var maxDuration time.Duration
-		var maxIndex int
+		var maxIndex int = -1
 		for i, v := range nodeMetric.Status.NodeMetric.AggregatedNodeUsages {
-			if v.Duration.Duration > maxDuration {
+			if len(v.Usage[aggregationType].ResourceList) > 0 && v.Duration.Duration > maxDuration {
 				maxDuration = v.Duration.Duration
 				maxIndex = i
 			}
 		}
-		aggregatedNodeUsage := &nodeMetric.Status.NodeMetric.AggregatedNodeUsages[maxIndex]
-		usage := aggregatedNodeUsage.Usage[aggregationType]
-		if len(usage.ResourceList) > 0 {
+
+		if maxIndex == -1 {
+			// All values in aggregatedDuration are empty, downgrade to use the values in NodeUsage
+			usage := nodeMetric.Status.NodeMetric.NodeUsage
+			if len(usage.ResourceList) > 0 {
+				return &usage
+			}
+		} else {
+			usage := nodeMetric.Status.NodeMetric.AggregatedNodeUsages[maxIndex].Usage[aggregationType]
 			return &usage
 		}
 	} else if aggregatedDuration != nil {
diff --git a/pkg/scheduler/plugins/loadaware/helper_test.go b/pkg/scheduler/plugins/loadaware/helper_test.go
new file mode 100644
index 000000000..52de3899f
--- /dev/null
+++ b/pkg/scheduler/plugins/loadaware/helper_test.go
@@ -0,0 +1,176 @@
+/*
+Copyright 2022 The Koordinator Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package loadaware
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"github.com/koordinator-sh/koordinator/apis/extension"
+	slov1alpha1 "github.com/koordinator-sh/koordinator/apis/slo/v1alpha1"
+)
+
+// Test cases description:
+// 1. When nodeMetric contains valid AggregatedNodeUsages and aggregatedDuration is nil, it should return the non-empty longest duration resource usage.
+// 2. When aggregatedDuration is not nil and matches a duration in AggregatedNodeUsages, it should return the corresponding resource usage.
+// 3. When nodeMetric's NodeUsage contains a valid resource list and AggregatedNodeUsages is empty, it should return the resource usage of NodeUsage.
+
+func TestGetTargetAggregatedUsage(t *testing.T) {
+	aggregationType := extension.P95
+	tests := []struct {
+		name               string
+		nodeMetric         *slov1alpha1.NodeMetric
+		aggregatedDuration *metav1.Duration
+
+		expectedResult *slov1alpha1.ResourceMap
+	}{
+		{
+			name: "Valid AggregatedNodeUsages and aggregatedDuration is nil",
+			nodeMetric: &slov1alpha1.NodeMetric{
+				Status: slov1alpha1.NodeMetricStatus{
+					NodeMetric: &slov1alpha1.NodeMetricInfo{
+						AggregatedNodeUsages: []slov1alpha1.AggregatedUsage{
+							{
+								Duration: metav1.Duration{Duration: 5 * time.Minute},
+								Usage: map[extension.AggregationType]slov1alpha1.ResourceMap{
+									aggregationType: {
+										ResourceList: corev1.ResourceList{
+											corev1.ResourceCPU: resource.MustParse("30"),
+										},
+									},
+								},
+							},
+							{
+								Duration: metav1.Duration{Duration: 10 * time.Minute},
+								Usage: map[extension.AggregationType]slov1alpha1.ResourceMap{
+									aggregationType: {
+										ResourceList: corev1.ResourceList{
+											corev1.ResourceCPU: resource.MustParse("50"),
+										},
+									},
+								},
+							},
+							{
+								Duration: metav1.Duration{Duration: 15 * time.Minute},
+								Usage: map[extension.AggregationType]slov1alpha1.ResourceMap{
+									aggregationType: {
+										ResourceList: nil,
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			aggregatedDuration: nil,
+			expectedResult: &slov1alpha1.ResourceMap{
+				ResourceList: corev1.ResourceList{
+					corev1.ResourceCPU: resource.MustParse("50"),
+				},
+			},
+		},
+		{
+			name: "aggregatedDuration is not nil and matches a duration",
+			nodeMetric: &slov1alpha1.NodeMetric{
+				Status: slov1alpha1.NodeMetricStatus{
+					NodeMetric: &slov1alpha1.NodeMetricInfo{
+						AggregatedNodeUsages: []slov1alpha1.AggregatedUsage{
+							{
+								Duration: metav1.Duration{Duration: 5 * time.Minute},
+								Usage: map[extension.AggregationType]slov1alpha1.ResourceMap{
+									aggregationType: {
+										ResourceList: corev1.ResourceList{
+											corev1.ResourceCPU: resource.MustParse("30"),
+										},
+									},
+								},
+							},
+							{
+								Duration: metav1.Duration{Duration: 10 * time.Minute},
+								Usage: map[extension.AggregationType]slov1alpha1.ResourceMap{
+									aggregationType: {
+										ResourceList: corev1.ResourceList{
+											corev1.ResourceCPU: resource.MustParse("50"),
+										},
+									},
+								},
+							},
+							{
+								Duration: metav1.Duration{Duration: 15 * time.Minute},
+								Usage: map[extension.AggregationType]slov1alpha1.ResourceMap{
+									aggregationType: {
+										ResourceList: corev1.ResourceList{
+											corev1.ResourceCPU: resource.MustParse("70"),
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			aggregatedDuration: &metav1.Duration{Duration: 5 * time.Minute},
+			expectedResult: &slov1alpha1.ResourceMap{
+				ResourceList: corev1.ResourceList{
+					corev1.ResourceCPU: resource.MustParse("30"),
+				},
+			},
+		},
+		{
+			name: "NodeUsage contains a valid resource list and AggregatedNodeUsages is empty",
+			nodeMetric: &slov1alpha1.NodeMetric{
+				Status: slov1alpha1.NodeMetricStatus{
+					NodeMetric: &slov1alpha1.NodeMetricInfo{
+						NodeUsage: slov1alpha1.ResourceMap{
+							ResourceList: corev1.ResourceList{
+								corev1.ResourceCPU: resource.MustParse("30"),
+							},
+						},
+						AggregatedNodeUsages: []slov1alpha1.AggregatedUsage{
+							{
+								Duration: metav1.Duration{Duration: 5 * time.Minute},
+								Usage: map[extension.AggregationType]slov1alpha1.ResourceMap{
+									aggregationType: {
+										ResourceList: nil,
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			aggregatedDuration: nil,
+			expectedResult: &slov1alpha1.ResourceMap{
+				ResourceList: corev1.ResourceList{
+					corev1.ResourceCPU: resource.MustParse("30"),
+				},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := getTargetAggregatedUsage(tt.nodeMetric, tt.aggregatedDuration, aggregationType)
+			assert.Equal(t, tt.expectedResult, result)
+		})
+	}
+}