diff --git a/manifests/crd.yaml b/manifests/crd.yaml
index 6200881614..5db040d740 100644
--- a/manifests/crd.yaml
+++ b/manifests/crd.yaml
@@ -7043,6 +7043,19 @@ spec:
                 the pd could provide it. MetricsUrl represents the url to fetch the
                 metrics info
               type: string
+            monitor:
+              description: TidbMonitorRef reference to a TidbMonitor
+              properties:
+                name:
+                  description: Name is the name of TidbMonitor object
+                  type: string
+                namespace:
+                  description: Namespace is the namespace that TidbMonitor object
+                    locates, default to the same namespace with TidbClusterAutoScaler
+                  type: string
+              required:
+              - name
+              type: object
             tidb:
               description: TidbAutoScalerSpec describes the spec for tidb auto-scaling
               properties:
diff --git a/pkg/apis/pingcap/v1alpha1/openapi_generated.go b/pkg/apis/pingcap/v1alpha1/openapi_generated.go
index bf5e202ba5..8fed6209b8 100644
--- a/pkg/apis/pingcap/v1alpha1/openapi_generated.go
+++ b/pkg/apis/pingcap/v1alpha1/openapi_generated.go
@@ -111,6 +111,7 @@ func GetOpenAPIDefinitions(ref common.ReferenceCallback) map[string]common.OpenA
 		"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbInitializerStatus":         schema_pkg_apis_pingcap_v1alpha1_TidbInitializerStatus(ref),
 		"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbMonitor":                   schema_pkg_apis_pingcap_v1alpha1_TidbMonitor(ref),
 		"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbMonitorList":               schema_pkg_apis_pingcap_v1alpha1_TidbMonitorList(ref),
+		"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbMonitorRef":                schema_pkg_apis_pingcap_v1alpha1_TidbMonitorRef(ref),
 		"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbMonitorSpec":               schema_pkg_apis_pingcap_v1alpha1_TidbMonitorSpec(ref),
 		"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TikvAutoScalerSpec":            schema_pkg_apis_pingcap_v1alpha1_TikvAutoScalerSpec(ref),
 		"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TxnLocalLatches":               schema_pkg_apis_pingcap_v1alpha1_TxnLocalLatches(ref),
@@ -5846,6 +5847,12 @@ func schema_pkg_apis_pingcap_v1alpha1_TidbClusterAutoScalerSpec(ref common.Refer
 							Format:      "",
 						},
 					},
+					"monitor": {
+						SchemaProps: spec.SchemaProps{
+							Description: "TidbMonitorRef describe the target TidbMonitor, when MetricsUrl and Monitor are both set, Operator will use MetricsUrl",
+							Ref:         ref("github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbMonitorRef"),
+						},
+					},
 					"tikv": {
 						SchemaProps: spec.SchemaProps{
 							Description: "TiKV represents the auto-scaling spec for tikv",
@@ -5863,7 +5870,7 @@ func schema_pkg_apis_pingcap_v1alpha1_TidbClusterAutoScalerSpec(ref common.Refer
 			},
 		},
 		Dependencies: []string{
-			"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbAutoScalerSpec", "github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbClusterRef", "github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TikvAutoScalerSpec"},
+			"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbAutoScalerSpec", "github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbClusterRef", "github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TidbMonitorRef", "github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1.TikvAutoScalerSpec"},
 	}
 }
 
@@ -6402,6 +6409,34 @@ func schema_pkg_apis_pingcap_v1alpha1_TidbMonitorList(ref common.ReferenceCallba
 	}
 }
 
+func schema_pkg_apis_pingcap_v1alpha1_TidbMonitorRef(ref common.ReferenceCallback) common.OpenAPIDefinition {
+	return common.OpenAPIDefinition{
+		Schema: spec.Schema{
+			SchemaProps: spec.SchemaProps{
+				Description: "TidbMonitorRef reference to a TidbMonitor",
+				Type:        []string{"object"},
+				Properties: map[string]spec.Schema{
+					"namespace": {
+						SchemaProps: spec.SchemaProps{
+							Description: "Namespace is the namespace that TidbMonitor object locates, default to the same namespace with TidbClusterAutoScaler",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"name": {
+						SchemaProps: spec.SchemaProps{
+							Description: "Name is the name of TidbMonitor object",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+				},
+				Required: []string{"name"},
+			},
+		},
+	}
+}
+
 func schema_pkg_apis_pingcap_v1alpha1_TidbMonitorSpec(ref common.ReferenceCallback) common.OpenAPIDefinition {
 	return common.OpenAPIDefinition{
 		Schema: spec.Schema{
diff --git a/pkg/apis/pingcap/v1alpha1/tidbclusterautoscaler_types.go b/pkg/apis/pingcap/v1alpha1/tidbclusterautoscaler_types.go
index 139ee7c744..a4639eabd8 100644
--- a/pkg/apis/pingcap/v1alpha1/tidbclusterautoscaler_types.go
+++ b/pkg/apis/pingcap/v1alpha1/tidbclusterautoscaler_types.go
@@ -58,6 +58,11 @@ type TidbClusterAutoScalerSpec struct {
 	// +optional
 	MetricsUrl *string `json:"metricsUrl,omitempty"`
 
+	// TidbMonitorRef describe the target TidbMonitor, when MetricsUrl and Monitor are both set,
+	// Operator will use MetricsUrl
+	// +optional
+	Monitor *TidbMonitorRef `json:"monitor,omitempty"`
+
 	// TiKV represents the auto-scaling spec for tikv
 	// +optional
 	TiKV *TikvAutoScalerSpec `json:"tikv,omitempty"`
@@ -132,6 +137,18 @@ type BasicAutoScalerSpec struct {
 	ScaleInThreshold *int32 `json:"scaleInThreshold,omitempty"`
 }
 
+// +k8s:openapi-gen=true
+// TidbMonitorRef reference to a TidbMonitor
+type TidbMonitorRef struct {
+	// Namespace is the namespace that TidbMonitor object locates,
+	// default to the same namespace with TidbClusterAutoScaler
+	// +optional
+	Namespace string `json:"namespace,omitempty"`
+
+	// Name is the name of TidbMonitor object
+	Name string `json:"name"`
+}
+
 // TODO: sync status
 type TidbClusterAutoSclaerStatus struct {
 }
diff --git a/pkg/apis/pingcap/v1alpha1/zz_generated.deepcopy.go b/pkg/apis/pingcap/v1alpha1/zz_generated.deepcopy.go
index 25aa9a0013..28786d2937 100644
--- a/pkg/apis/pingcap/v1alpha1/zz_generated.deepcopy.go
+++ b/pkg/apis/pingcap/v1alpha1/zz_generated.deepcopy.go
@@ -3870,6 +3870,11 @@ func (in *TidbClusterAutoScalerSpec) DeepCopyInto(out *TidbClusterAutoScalerSpec
 		*out = new(string)
 		**out = **in
 	}
+	if in.Monitor != nil {
+		in, out := &in.Monitor, &out.Monitor
+		*out = new(TidbMonitorRef)
+		**out = **in
+	}
 	if in.TiKV != nil {
 		in, out := &in.TiKV, &out.TiKV
 		*out = new(TikvAutoScalerSpec)
@@ -4244,6 +4249,22 @@ func (in *TidbMonitorList) DeepCopyObject() runtime.Object {
 	return nil
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *TidbMonitorRef) DeepCopyInto(out *TidbMonitorRef) {
+	*out = *in
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new TidbMonitorRef.
+func (in *TidbMonitorRef) DeepCopy() *TidbMonitorRef {
+	if in == nil {
+		return nil
+	}
+	out := new(TidbMonitorRef)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *TidbMonitorSpec) DeepCopyInto(out *TidbMonitorSpec) {
 	*out = *in
diff --git a/pkg/autoscaler/autoscaler/autoscaler_manager.go b/pkg/autoscaler/autoscaler/autoscaler_manager.go
index e74ab35fbe..3bbc7c7454 100644
--- a/pkg/autoscaler/autoscaler/autoscaler_manager.go
+++ b/pkg/autoscaler/autoscaler/autoscaler_manager.go
@@ -21,7 +21,6 @@ import (
 	informers "github.com/pingcap/tidb-operator/pkg/client/informers/externalversions"
 	v1alpha1listers "github.com/pingcap/tidb-operator/pkg/client/listers/pingcap/v1alpha1"
 	"github.com/pingcap/tidb-operator/pkg/controller"
-	promClient "github.com/prometheus/client_golang/api"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
@@ -88,21 +87,14 @@ func (am *autoScalerManager) Sync(tac *v1alpha1.TidbClusterAutoScaler) error {
 }
 
 func (am *autoScalerManager) syncAutoScaling(tc *v1alpha1.TidbCluster, tac *v1alpha1.TidbClusterAutoScaler) error {
-	if tac.Spec.MetricsUrl == nil {
-		return fmt.Errorf("tidbclusterAutoScaler[%s/%s]' metrics url should be defined explicitly", tac.Namespace, tac.Name)
-	}
-	c, err := promClient.NewClient(promClient.Config{Address: *tac.Spec.MetricsUrl})
-	if err != nil {
-		return err
-	}
 	defaultTAC(tac)
 	oldTikvReplicas := tc.Spec.TiKV.Replicas
-	if err := am.syncTiKV(tc, tac, c); err != nil {
+	if err := am.syncTiKV(tc, tac); err != nil {
 		tc.Spec.TiKV.Replicas = oldTikvReplicas
 		klog.Errorf("tac[%s/%s] tikv sync failed, continue to sync next, err:%v", tac.Namespace, tac.Name, err)
 	}
 	oldTidbReplicas := tc.Spec.TiDB.Replicas
-	if err := am.syncTiDB(tc, tac, c); err != nil {
+	if err := am.syncTiDB(tc, tac); err != nil {
 		tc.Spec.TiDB.Replicas = oldTidbReplicas
 		klog.Errorf("tac[%s/%s] tidb sync failed, continue to sync next, err:%v", tac.Namespace, tac.Name, err)
 	}
diff --git a/pkg/autoscaler/autoscaler/calculate/calculate.go b/pkg/autoscaler/autoscaler/calculate/calculate.go
index 0d1f9e8413..b01132fec1 100644
--- a/pkg/autoscaler/autoscaler/calculate/calculate.go
+++ b/pkg/autoscaler/autoscaler/calculate/calculate.go
@@ -36,6 +36,7 @@ const (
 )
 
 type SingleQuery struct {
+	Endpoint  string
 	Timestamp int64
 	Quary     string
 	Instances []string
@@ -45,7 +46,7 @@ type SingleQuery struct {
 func queryMetricsFromPrometheus(tac *v1alpha1.TidbClusterAutoScaler, client promClient.Client, sq *SingleQuery, resp *Response) error {
 	query := sq.Quary
 	timestamp := sq.Timestamp
-	req, err := http.NewRequest("GET", fmt.Sprintf("%s%s", *tac.Spec.MetricsUrl, queryPath), nil)
+	req, err := http.NewRequest("GET", fmt.Sprintf("%s%s", sq.Endpoint, queryPath), nil)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/autoscaler/autoscaler/tidb_autoscaler.go b/pkg/autoscaler/autoscaler/tidb_autoscaler.go
index e4bed4f69e..19179b3b61 100644
--- a/pkg/autoscaler/autoscaler/tidb_autoscaler.go
+++ b/pkg/autoscaler/autoscaler/tidb_autoscaler.go
@@ -25,7 +25,7 @@ import (
 	appsv1 "k8s.io/api/apps/v1"
 )
 
-func (am *autoScalerManager) syncTiDB(tc *v1alpha1.TidbCluster, tac *v1alpha1.TidbClusterAutoScaler, client promClient.Client) error {
+func (am *autoScalerManager) syncTiDB(tc *v1alpha1.TidbCluster, tac *v1alpha1.TidbClusterAutoScaler) error {
 	if tac.Spec.TiDB == nil {
 		return nil
 	}
@@ -38,7 +38,7 @@ func (am *autoScalerManager) syncTiDB(tc *v1alpha1.TidbCluster, tac *v1alpha1.Ti
 	}
 	currentReplicas := tc.Spec.TiDB.Replicas
 	instances := filterTidbInstances(tc)
-	targetReplicas, err := calculateTidbMetrics(tac, sts, client, instances)
+	targetReplicas, err := calculateTidbMetrics(tac, sts, instances)
 	if err != nil {
 		return err
 	}
@@ -73,7 +73,15 @@ func updateTcTiDBAnnIfScale(tac *v1alpha1.TidbClusterAutoScaler) {
 	tac.Annotations[label.AnnTiDBLastAutoScalingTimestamp] = fmt.Sprintf("%d", time.Now().Unix())
 }
 
-func calculateTidbMetrics(tac *v1alpha1.TidbClusterAutoScaler, sts *appsv1.StatefulSet, client promClient.Client, instances []string) (int32, error) {
+func calculateTidbMetrics(tac *v1alpha1.TidbClusterAutoScaler, sts *appsv1.StatefulSet, instances []string) (int32, error) {
+	ep, err := genMetricsEndpoint(tac)
+	if err != nil {
+		return -1, err
+	}
+	client, err := promClient.NewClient(promClient.Config{Address: ep})
+	if err != nil {
+		return -1, err
+	}
 	metric := calculate.FilterMetrics(tac.Spec.TiDB.Metrics)
 	mType, err := calculate.GenMetricType(tac, metric)
 	if err != nil {
@@ -84,6 +92,7 @@ func calculateTidbMetrics(tac *v1alpha1.TidbClusterAutoScaler, sts *appsv1.State
 		return -1, err
 	}
 	sq := &calculate.SingleQuery{
+		Endpoint:  ep,
 		Timestamp: time.Now().Unix(),
 		Instances: instances,
 		Metric:    metric,
diff --git a/pkg/autoscaler/autoscaler/tikv_autoscaler.go b/pkg/autoscaler/autoscaler/tikv_autoscaler.go
index 192ebb62cb..f20de7de4c 100644
--- a/pkg/autoscaler/autoscaler/tikv_autoscaler.go
+++ b/pkg/autoscaler/autoscaler/tikv_autoscaler.go
@@ -25,7 +25,7 @@ import (
 	appsv1 "k8s.io/api/apps/v1"
 )
 
-func (am *autoScalerManager) syncTiKV(tc *v1alpha1.TidbCluster, tac *v1alpha1.TidbClusterAutoScaler, client promClient.Client) error {
+func (am *autoScalerManager) syncTiKV(tc *v1alpha1.TidbCluster, tac *v1alpha1.TidbClusterAutoScaler) error {
 	if tac.Spec.TiKV == nil {
 		return nil
 	}
@@ -38,7 +38,7 @@ func (am *autoScalerManager) syncTiKV(tc *v1alpha1.TidbCluster, tac *v1alpha1.Ti
 	}
 	instances := filterTiKVInstances(tc)
 	currentReplicas := int32(len(instances))
-	targetReplicas, err := calculateTikvMetrics(tac, sts, client, instances)
+	targetReplicas, err := calculateTikvMetrics(tac, sts, instances)
 	if err != nil {
 		return err
 	}
@@ -87,7 +87,16 @@ func updateTcTiKVAnnIfScale(tac *v1alpha1.TidbClusterAutoScaler) {
 	tac.Annotations[label.AnnTiKVLastAutoScalingTimestamp] = fmt.Sprintf("%d", time.Now().Unix())
 }
 
-func calculateTikvMetrics(tac *v1alpha1.TidbClusterAutoScaler, sts *appsv1.StatefulSet, client promClient.Client, instances []string) (int32, error) {
+func calculateTikvMetrics(tac *v1alpha1.TidbClusterAutoScaler, sts *appsv1.StatefulSet, instances []string) (int32, error) {
+	ep, err := genMetricsEndpoint(tac)
+	if err != nil {
+		return -1, err
+	}
+	client, err := promClient.NewClient(promClient.Config{Address: ep})
+	if err != nil {
+		return -1, err
+	}
+
 	metric := calculate.FilterMetrics(tac.Spec.TiKV.Metrics)
 	mType, err := calculate.GenMetricType(tac, metric)
 	if err != nil {
@@ -99,6 +108,7 @@ func calculateTikvMetrics(tac *v1alpha1.TidbClusterAutoScaler, sts *appsv1.State
 		return -1, err
 	}
 	sq := &calculate.SingleQuery{
+		Endpoint:  ep,
 		Timestamp: time.Now().Unix(),
 		Instances: instances,
 		Metric:    metric,
diff --git a/pkg/autoscaler/autoscaler/util.go b/pkg/autoscaler/autoscaler/util.go
index ab6ceedaa3..9f21156475 100644
--- a/pkg/autoscaler/autoscaler/util.go
+++ b/pkg/autoscaler/autoscaler/util.go
@@ -14,6 +14,7 @@
 package autoscaler
 
 import (
+	"fmt"
 	"strconv"
 	"time"
 
@@ -174,6 +175,12 @@ func defaultTAC(tac *v1alpha1.TidbClusterAutoScaler) {
 			tac.Spec.TiDB.ScaleInIntervalSeconds = pointer.Int32Ptr(500)
 		}
 	}
+
+	if tac.Spec.Monitor != nil {
+		if len(tac.Spec.Monitor.Namespace) < 1 {
+			tac.Spec.Monitor.Namespace = tac.Namespace
+		}
+	}
 }
 
 func resetAutoScalingAnn(tac *v1alpha1.TidbClusterAutoScaler) {
@@ -198,3 +205,13 @@ func checkAndUpdateTacAnn(tac *v1alpha1.TidbClusterAutoScaler) {
 	// If not satisfied, reset tac Ann
 	resetAutoScalingAnn(tac)
 }
+
+func genMetricsEndpoint(tac *v1alpha1.TidbClusterAutoScaler) (string, error) {
+	if tac.Spec.MetricsUrl == nil && tac.Spec.Monitor == nil {
+		return "", fmt.Errorf("tac[%s/%s] metrics url or monitor should be defined explicitly", tac.Namespace, tac.Name)
+	}
+	if tac.Spec.MetricsUrl != nil {
+		return *tac.Spec.MetricsUrl, nil
+	}
+	return fmt.Sprintf("http://%s-prometheus.%s.svc:9090", tac.Spec.Monitor.Name, tac.Spec.Monitor.Namespace), nil
+}