diff --git a/docs/api-references/docs.md b/docs/api-references/docs.md
index 859f90417cc..9ade2871b7e 100644
--- a/docs/api-references/docs.md
+++ b/docs/api-references/docs.md
@@ -14251,7 +14251,7 @@ Only valid in Prometheus versions 2.15.0 and newer.</p>
 <td>
 <code>remoteTimeout</code></br>
 <em>
-github.com/prometheus/common/model.Duration
+string
 </em>
 </td>
 <td>
diff --git a/manifests/crd.yaml b/manifests/crd.yaml
index 64f5f85d879..dbead2f6775 100644
--- a/manifests/crd.yaml
+++ b/manifests/crd.yaml
@@ -51296,8 +51296,8 @@ spec:
                               type: integer
                           type: object
                         remoteTimeout:
-                          format: int64
-                          type: integer
+                          pattern: ^\d+[smhd]$
+                          type: string
                         tlsConfig:
                           properties:
                             ca:
diff --git a/manifests/crd/v1/pingcap.com_tidbmonitors.yaml b/manifests/crd/v1/pingcap.com_tidbmonitors.yaml
index 14dfb2d2984..c72da8fb733 100644
--- a/manifests/crd/v1/pingcap.com_tidbmonitors.yaml
+++ b/manifests/crd/v1/pingcap.com_tidbmonitors.yaml
@@ -1891,8 +1891,8 @@ spec:
                               type: integer
                           type: object
                         remoteTimeout:
-                          format: int64
-                          type: integer
+                          pattern: ^\d+[smhd]$
+                          type: string
                         tlsConfig:
                           properties:
                             ca:
diff --git a/pkg/apis/pingcap/v1alpha1/openapi_generated.go b/pkg/apis/pingcap/v1alpha1/openapi_generated.go
index f94ca25df16..9b7d3e28c47 100644
--- a/pkg/apis/pingcap/v1alpha1/openapi_generated.go
+++ b/pkg/apis/pingcap/v1alpha1/openapi_generated.go
@@ -7977,8 +7977,8 @@ func schema_pkg_apis_pingcap_v1alpha1_RemoteWriteSpec(ref common.ReferenceCallba
 					},
 					"remoteTimeout": {
 						SchemaProps: spec.SchemaProps{
-							Type:   []string{"integer"},
-							Format: "int64",
+							Type:   []string{"string"},
+							Format: "",
 						},
 					},
 					"writeRelabelConfigs": {
diff --git a/pkg/apis/pingcap/v1alpha1/tidbmonitor_types.go b/pkg/apis/pingcap/v1alpha1/tidbmonitor_types.go
index 665d1833aba..95b4c719167 100644
--- a/pkg/apis/pingcap/v1alpha1/tidbmonitor_types.go
+++ b/pkg/apis/pingcap/v1alpha1/tidbmonitor_types.go
@@ -445,8 +445,9 @@ type RemoteWriteSpec struct {
 	// Only valid in Prometheus versions 2.15.0 and newer.
 	// +optional
 	Name string `json:"name,omitempty"`
+	// +kubebuilder:validation:Pattern=`^\d+[smhd]$`
 	// +optional
-	RemoteTimeout *model.Duration `json:"remoteTimeout,omitempty"`
+	RemoteTimeout string `json:"remoteTimeout,omitempty"`
 	// The list of remote write relabel configurations.
 	// +optional
 	WriteRelabelConfigs []RelabelConfig `json:"writeRelabelConfigs,omitempty"`
diff --git a/pkg/apis/pingcap/v1alpha1/zz_generated.deepcopy.go b/pkg/apis/pingcap/v1alpha1/zz_generated.deepcopy.go
index 877baa02247..7cd8c5d5ef7 100644
--- a/pkg/apis/pingcap/v1alpha1/zz_generated.deepcopy.go
+++ b/pkg/apis/pingcap/v1alpha1/zz_generated.deepcopy.go
@@ -4825,11 +4825,6 @@ func (in *ReloaderSpec) DeepCopy() *ReloaderSpec {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *RemoteWriteSpec) DeepCopyInto(out *RemoteWriteSpec) {
 	*out = *in
-	if in.RemoteTimeout != nil {
-		in, out := &in.RemoteTimeout, &out.RemoteTimeout
-		*out = new(model.Duration)
-		**out = **in
-	}
 	if in.WriteRelabelConfigs != nil {
 		in, out := &in.WriteRelabelConfigs, &out.WriteRelabelConfigs
 		*out = make([]RelabelConfig, len(*in))
diff --git a/pkg/monitor/monitor/monitor_manager_test.go b/pkg/monitor/monitor/monitor_manager_test.go
index e98038acd78..cf7256e6eb2 100644
--- a/pkg/monitor/monitor/monitor_manager_test.go
+++ b/pkg/monitor/monitor/monitor_manager_test.go
@@ -141,13 +141,13 @@ func TestTidbMonitorSyncCreate(t *testing.T) {
 				g.Expect(err).NotTo(HaveOccurred())
 
 				url := "http://127.0.0.1/a/b/c"
-				remoteTimeout := model.Duration(30 * time.Second)
+				remoteTimeout := "30s"
 				testTime := 10 * time.Second
 				monitor.Spec.Prometheus.RemoteWrite = []*v1alpha1.RemoteWriteSpec{
 					{
 						URL:           url,
 						Name:          "test",
-						RemoteTimeout: &remoteTimeout,
+						RemoteTimeout: remoteTimeout,
 						WriteRelabelConfigs: []v1alpha1.RelabelConfig{
 							{
 								SourceLabels: []model.LabelName{"test1", "test2"},
diff --git a/pkg/monitor/monitor/util.go b/pkg/monitor/monitor/util.go
index f06558d5e0f..47a376f1862 100644
--- a/pkg/monitor/monitor/util.go
+++ b/pkg/monitor/monitor/util.go
@@ -19,7 +19,6 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"time"
 
 	semver "github.com/Masterminds/semver"
 	"github.com/pingcap/tidb-operator/pkg/apis/label"
@@ -1487,9 +1486,8 @@ func generateRemoteWrite(monitor *v1alpha1.TidbMonitor, store *Store) (yaml.MapI
 	}
 	for i, spec := range monitor.Spec.Prometheus.RemoteWrite {
 		//defaults
-		if spec.RemoteTimeout == nil {
-			duration := model.Duration(30 * time.Second)
-			spec.RemoteTimeout = &duration
+		if spec.RemoteTimeout == "" {
+			spec.RemoteTimeout = "30s"
 		}
 
 		cfg := yaml.MapSlice{
diff --git a/pkg/monitor/monitor/util_test.go b/pkg/monitor/monitor/util_test.go
index f4c63c25d51..8ffc96e9a5e 100644
--- a/pkg/monitor/monitor/util_test.go
+++ b/pkg/monitor/monitor/util_test.go
@@ -56,7 +56,7 @@ func TestGenerateRemoteWrite(t *testing.T) {
     max_backoff: 10s
 `
 	url := "http://127.0.0.1/a/b/c"
-	remoteTimeout := model.Duration(30 * time.Second)
+	remoteTimeout := "30s"
 	testTime := 10 * time.Second
 	monitor := v1alpha1.TidbMonitor{
 		Spec: v1alpha1.TidbMonitorSpec{
@@ -65,7 +65,7 @@ func TestGenerateRemoteWrite(t *testing.T) {
 					{
 						URL:           url,
 						Name:          "test",
-						RemoteTimeout: &remoteTimeout,
+						RemoteTimeout: remoteTimeout,
 						WriteRelabelConfigs: []v1alpha1.RelabelConfig{
 							{
 								SourceLabels: []model.LabelName{"test1", "test2"},
@@ -161,7 +161,7 @@ func TestGenerateRemoteWriteWithHighVersion(t *testing.T) {
     send_interval: 10s
 `
 	url := "http://127.0.0.1/a/b/c"
-	remoteTimeout := model.Duration(30 * time.Second)
+	remoteTimeout := "30s"
 	testTime := 10 * time.Second
 	monitor := v1alpha1.TidbMonitor{
 		Spec: v1alpha1.TidbMonitorSpec{
@@ -170,7 +170,7 @@ func TestGenerateRemoteWriteWithHighVersion(t *testing.T) {
 					{
 						URL:           url,
 						Name:          "test",
-						RemoteTimeout: &remoteTimeout,
+						RemoteTimeout: remoteTimeout,
 						WriteRelabelConfigs: []v1alpha1.RelabelConfig{
 							{
 								SourceLabels: []model.LabelName{"test1", "test2"},