diff --git a/cmd/main.go b/cmd/main.go
index 04b3340c..f2fd19b3 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -23,6 +23,7 @@ import (
 	"os"
 	"time"
 
+	"github.com/StarRocks/starrocks-kubernetes-operator/pkg/k8sutils"
 	"k8s.io/klog/v2"
 
 	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
@@ -119,6 +120,10 @@ func main() {
 		os.Exit(1)
 	}
 
+	if err := k8sutils.GetKubernetesVersion(); err != nil {
+		setupLog.Error(err, "unable to get kubernetes version, continue to start manager")
+	}
+
 	setupLog.Info("starting manager")
 	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
 		setupLog.Error(err, "problem running manager")
diff --git a/config/crd/bases/starrocks.com_starrocksclusters.yaml b/config/crd/bases/starrocks.com_starrocksclusters.yaml
index f8369f07..020ea947 100644
--- a/config/crd/bases/starrocks.com_starrocksclusters.yaml
+++ b/config/crd/bases/starrocks.com_starrocksclusters.yaml
@@ -2872,7 +2872,6 @@ spec:
                         format: int32
                         type: integer
                       version:
-                        default: v2beta2
                         description: version represents the autoscaler version for
                           cn service. only support v1,v2beta2,v2
                         type: string
diff --git a/deploy/starrocks.com_starrocksclusters.yaml b/deploy/starrocks.com_starrocksclusters.yaml
index 1f74e2de..e3069b56 100644
--- a/deploy/starrocks.com_starrocksclusters.yaml
+++ b/deploy/starrocks.com_starrocksclusters.yaml
@@ -1312,7 +1312,6 @@ spec:
                         format: int32
                         type: integer
                       version:
-                        default: v2beta2
                         type: string
                     required:
                     - maxReplicas
diff --git a/pkg/apis/starrocks/v1/auto_scale.go b/pkg/apis/starrocks/v1/auto_scale.go
index c2352d4d..a7aca9f7 100644
--- a/pkg/apis/starrocks/v1/auto_scale.go
+++ b/pkg/apis/starrocks/v1/auto_scale.go
@@ -17,6 +17,8 @@ limitations under the License.
 package v1
 
 import (
+	"strconv"
+
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -28,7 +30,7 @@ type AutoScalingPolicy struct {
 	HPAPolicy *HPAPolicy `json:"hpaPolicy,omitempty"`
 
 	// version represents the autoscaler version for cn service. only support v1,v2beta2,v2
-	// +kubebuilder:default:="v2beta2"
+	// +optional
 	Version AutoScalerVersion `json:"version,omitempty"`
 
 	// MinReplicas is the lower limit for the number of replicas to which the autoscaler
@@ -54,6 +56,28 @@ const (
 	AutoScalerV2 AutoScalerVersion = "v2"
 )
 
+// Complete() completes the default value of AutoScalerVersion
+func (version AutoScalerVersion) Complete(major, minor string) AutoScalerVersion {
+	if version != "" {
+		return version
+	}
+	// operator choose a proper default hpa version by checking ths kubernetes version
+	// if the minor version of kubernetes version >= 26, use v2 version
+	if major == "1" {
+		minorNumber, err := strconv.Atoi(minor)
+		if err != nil {
+			// keep backward compatibility
+			return AutoScalerV2Beta2
+		}
+		if minorNumber >= 26 {
+			return AutoScalerV2
+		} else {
+			return AutoScalerV2Beta2
+		}
+	}
+	return AutoScalerV2
+}
+
 type HPAPolicy struct {
 	// +optional
 	// Metrics specifies how to scale based on a single metric
diff --git a/pkg/apis/starrocks/v1/auto_scale_test.go b/pkg/apis/starrocks/v1/auto_scale_test.go
new file mode 100644
index 00000000..d2b0e66b
--- /dev/null
+++ b/pkg/apis/starrocks/v1/auto_scale_test.go
@@ -0,0 +1,69 @@
+package v1
+
+import "testing"
+
+func TestAutoScalerVersion_Complete(t *testing.T) {
+	type args struct {
+		major string
+		minor string
+	}
+	tests := []struct {
+		name    string
+		version AutoScalerVersion
+		args    args
+		want    AutoScalerVersion
+	}{
+		{
+			name:    "test for version v1",
+			version: AutoScalerV1,
+			args:    args{},
+			want:    AutoScalerV1,
+		},
+		{
+			name:    "test for version v2",
+			version: AutoScalerV2,
+			args:    args{},
+			want:    AutoScalerV2,
+		},
+		{
+			name:    "test for version v2beta2",
+			version: AutoScalerV2Beta2,
+			args:    args{},
+			want:    AutoScalerV2Beta2,
+		},
+		{
+			name:    "test for empty version",
+			version: "",
+			args: args{
+				major: "1",
+				minor: "26",
+			},
+			want: AutoScalerV2,
+		},
+		{
+			name:    "test for empty version2",
+			version: "",
+			args: args{
+				major: "1",
+				minor: "25",
+			},
+			want: AutoScalerV2Beta2,
+		},
+		{
+			name:    "test for empty version3",
+			version: "",
+			args: args{
+				major: "1",
+				minor: "23",
+			},
+			want: AutoScalerV2Beta2,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.version.Complete(tt.args.major, tt.args.minor); got != tt.want {
+				t.Errorf("Complete() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/pkg/common/resource_utils/autoscaler.go b/pkg/common/resource_utils/autoscaler.go
index 06c7239f..3b972acd 100644
--- a/pkg/common/resource_utils/autoscaler.go
+++ b/pkg/common/resource_utils/autoscaler.go
@@ -20,6 +20,7 @@ import (
 	"unsafe"
 
 	srapi "github.com/StarRocks/starrocks-kubernetes-operator/pkg/apis/starrocks/v1"
+	"github.com/StarRocks/starrocks-kubernetes-operator/pkg/k8sutils"
 	appv1 "k8s.io/api/apps/v1"
 	v1 "k8s.io/api/autoscaling/v1"
 	v2 "k8s.io/api/autoscaling/v2"
@@ -45,14 +46,17 @@ type PodAutoscalerParams struct {
 }
 
 func BuildHorizontalPodAutoscaler(pap *PodAutoscalerParams) client.Object {
-	switch pap.AutoscalerType {
+	t := pap.AutoscalerType.Complete(k8sutils.KUBE_MAJOR_VERSION, k8sutils.KUBE_MINOR_VERSION)
+	switch t {
 	case srapi.AutoScalerV1:
 		return buildAutoscalerV1(pap)
 	case srapi.AutoScalerV2:
 		return buildAutoscalerV2(pap)
-	default:
+	case srapi.AutoScalerV2Beta2:
 		return buildAutoscalerV2beta2(pap)
 	}
+	// can not reach here
+	return buildAutoscalerV2beta2(pap)
 }
 
 // build v1 autoscaler
diff --git a/pkg/k8sutils/k8sutils.go b/pkg/k8sutils/k8sutils.go
index 956138f5..d7810cfb 100644
--- a/pkg/k8sutils/k8sutils.go
+++ b/pkg/k8sutils/k8sutils.go
@@ -30,6 +30,9 @@ import (
 	corev1 "k8s.io/api/core/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/client-go/discovery"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
 	"k8s.io/klog/v2"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 )
@@ -287,3 +290,36 @@ func GetConfigMap(ctx context.Context, k8scient client.Client, namespace, name s
 
 	return &configMap, nil
 }
+
+var (
+	KUBE_MAJOR_VERSION string
+	KUBE_MINOR_VERSION string
+)
+
+// GetKubernetesVersion get kubernetes version. It should not be executed concurrently.
+// The global variable KUBE_MAJOR_VERSION and KUBE_MINOR_VERSION will be set.
+func GetKubernetesVersion() error {
+	config, err := clientcmd.BuildConfigFromFlags("", "~/.kube/config")
+	if err != nil {
+		config, err = rest.InClusterConfig()
+		if err != nil {
+			return err
+		}
+	}
+
+	// create a discovery.DiscoveryClient object to query the metadata of the API server
+	discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
+	if err != nil {
+		return err
+	}
+
+	// query the version information of the API server
+	version, err := discoveryClient.ServerVersion()
+	if err != nil {
+		return err
+	}
+
+	KUBE_MAJOR_VERSION = version.Major
+	KUBE_MINOR_VERSION = version.Minor
+	return nil
+}
diff --git a/pkg/sub_controller/cn/cn_controller.go b/pkg/sub_controller/cn/cn_controller.go
index 2bf83ace..561b52ab 100644
--- a/pkg/sub_controller/cn/cn_controller.go
+++ b/pkg/sub_controller/cn/cn_controller.go
@@ -206,7 +206,8 @@ func (cc *CnController) UpdateStatus(src *srapi.StarRocksCluster) error {
 
 	if cnSpec.AutoScalingPolicy != nil {
 		cs.HorizontalScaler.Name = cc.generateAutoScalerName(src)
-		cs.HorizontalScaler.Version = cnSpec.AutoScalingPolicy.Version
+		cs.HorizontalScaler.Version = cnSpec.AutoScalingPolicy.Version.Complete(k8sutils.KUBE_MAJOR_VERSION,
+			k8sutils.KUBE_MINOR_VERSION)
 	} else {
 		cs.HorizontalScaler = srapi.HorizontalScaler{}
 	}