diff --git a/cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud_service_manager.go b/cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud_service_manager.go
index c07dd101e2..fe12b54470 100644
--- a/cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud_service_manager.go
+++ b/cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud_service_manager.go
@@ -22,6 +22,7 @@ import (
 
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/autoscaler/cluster-autoscaler/cloudprovider"
+	"k8s.io/autoscaler/cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud-sdk-go-v3/core/sdktime"
 	huaweicloudsdkas "k8s.io/autoscaler/cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud-sdk-go-v3/services/as/v1"
 	huaweicloudsdkasmodel "k8s.io/autoscaler/cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud-sdk-go-v3/services/as/v1/model"
 	huaweicloudsdkecs "k8s.io/autoscaler/cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud-sdk-go-v3/services/ecs/v2"
@@ -188,9 +189,75 @@ func (csm *cloudServiceManager) GetInstances(groupID string) ([]cloudprovider.In
 	return instances, nil
 }
 
+// IncreaseSizeInstance increases a scaling group's instance size.
+// The workflow works as follows:
+// 1. create scaling policy with scheduled type.
+// 2. execute the scaling policy immediately(not waiting the policy's launch time).
+// 3. wait for the instance number be increased and remove the scaling policy.
 func (csm *cloudServiceManager) IncreaseSizeInstance(groupID string, delta int) error {
-	// TODO(RainbowMango) finish implementation later
-	return nil
+	originalInstanceSize, err := csm.GetDesireInstanceNumber(groupID)
+	if err != nil {
+		return err
+	}
+
+	// create a scaling policy
+	launchTime := sdktime.SdkTime(time.Now().Add(time.Hour))
+	addOperation := huaweicloudsdkasmodel.GetScalingPolicyActionOperationEnum().ADD
+	instanceNum := int32(delta)
+	opts := &huaweicloudsdkasmodel.CreateScalingPolicyRequest{
+		Body: &huaweicloudsdkasmodel.CreateScalingPolicyRequestBody{
+			// It's not mandatory for AS service to set a unique policy name.
+			ScalingPolicyName: "huaweicloudautoscaler",
+			ScalingGroupId:    groupID,
+			ScalingPolicyType: huaweicloudsdkasmodel.GetCreateScalingPolicyRequestBodyScalingPolicyTypeEnum().SCHEDULED,
+			ScheduledPolicy: &huaweicloudsdkasmodel.ScheduledPolicy{
+				LaunchTime: &launchTime,
+			},
+			ScalingPolicyAction: &huaweicloudsdkasmodel.ScalingPolicyAction{
+				Operation:      &addOperation,
+				InstanceNumber: &instanceNum,
+			},
+		},
+	}
+
+	spID, err := csm.createScalingPolicy(opts)
+	if err != nil {
+		return err
+	}
+
+	// make sure scaling policy will be cleaned up.
+	deletePolicyOps := &huaweicloudsdkasmodel.DeleteScalingPolicyRequest{
+		ScalingPolicyId: spID,
+	}
+	defer csm.deleteScalingPolicy(deletePolicyOps)
+
+	// execute policy immediately
+	executeAction := huaweicloudsdkasmodel.GetExecuteScalingPolicyRequestBodyActionEnum()
+	executeOpts := &huaweicloudsdkasmodel.ExecuteScalingPolicyRequest{
+		ScalingPolicyId: spID,
+		Body: &huaweicloudsdkasmodel.ExecuteScalingPolicyRequestBody{
+			Action: &executeAction.EXECUTE,
+		},
+	}
+	err = csm.executeScalingPolicy(executeOpts)
+	if err != nil {
+		return err
+	}
+
+	// wait for instance number indeed be increased
+	return wait.Poll(5*time.Second, 300*time.Second, func() (done bool, err error) {
+		currentInstanceSize, err := csm.GetDesireInstanceNumber(groupID)
+		if err != nil {
+			return false, err
+		}
+
+		if currentInstanceSize == originalInstanceSize+delta {
+			return true, nil
+		}
+		klog.V(1).Infof("waiting instance increase from %d to %d, now is: %d", originalInstanceSize, originalInstanceSize+delta, currentInstanceSize)
+
+		return false, nil
+	})
 }
 
 func (csm *cloudServiceManager) ListScalingGroups() ([]AutoScalingGroup, error) {
@@ -268,3 +335,52 @@ func (csm *cloudServiceManager) transformInstanceState(lifeCycleState huaweiclou
 
 	return instanceStatus
 }
+
+func (csm *cloudServiceManager) createScalingPolicy(opts *huaweicloudsdkasmodel.CreateScalingPolicyRequest) (scalingPolicyID string, err error) {
+	asClient := csm.getASClientFunc()
+	if asClient == nil {
+		return "", fmt.Errorf("failed to get as client")
+	}
+
+	response, err := asClient.CreateScalingPolicy(opts)
+	if err != nil {
+		klog.Warningf("create scaling policy failed. policy: %s, error: %v", opts.String(), err)
+		return "", err
+	}
+
+	klog.V(1).Infof("create scaling policy succeed. policy id: %s", *(response.ScalingPolicyId))
+
+	return *(response.ScalingPolicyId), nil
+}
+
+func (csm *cloudServiceManager) executeScalingPolicy(opts *huaweicloudsdkasmodel.ExecuteScalingPolicyRequest) error {
+	asClient := csm.getASClientFunc()
+	if asClient == nil {
+		return fmt.Errorf("failed to get as client")
+	}
+
+	_, err := asClient.ExecuteScalingPolicy(opts)
+	if err != nil {
+		klog.Warningf("execute scaling policy failed. policy id: %s, error: %v", opts.ScalingPolicyId, err)
+		return err
+	}
+
+	klog.V(1).Infof("execute scaling policy succeed. policy id: %s", opts.ScalingPolicyId)
+	return nil
+}
+
+func (csm *cloudServiceManager) deleteScalingPolicy(opts *huaweicloudsdkasmodel.DeleteScalingPolicyRequest) error {
+	asClient := csm.getASClientFunc()
+	if asClient == nil {
+		return fmt.Errorf("failed to get as client")
+	}
+
+	_, err := asClient.DeleteScalingPolicy(opts)
+	if err != nil {
+		klog.Warningf("failed to delete scaling policy. policy id: %s, error: %v", opts.ScalingPolicyId, err)
+		return err
+	}
+
+	klog.V(1).Infof("delete scaling policy succeed. policy id: %s", opts.ScalingPolicyId)
+	return nil
+}