diff --git a/pkg/apis/pingcap/v1alpha1/validation/validation.go b/pkg/apis/pingcap/v1alpha1/validation/validation.go
index 7e47317799..0af83133b6 100644
--- a/pkg/apis/pingcap/v1alpha1/validation/validation.go
+++ b/pkg/apis/pingcap/v1alpha1/validation/validation.go
@@ -199,6 +199,14 @@ func validateTiFlashSpec(spec *v1alpha1.TiFlashSpec, fldPath *field.Path) field.
 			spec.StorageClaims, "storageClaims should be configured at least one item."))
 	}
 	allErrs = append(allErrs, validateScalePolicy(&spec.ScalePolicy, fldPath.Child("scalePolicy"))...)
+
+	// fix storageClaim
+	for _, storageClaim := range spec.StorageClaims {
+		if _, ok := storageClaim.Resources.Requests["storage"]; !ok {
+			allErrs = append(allErrs, field.Invalid(fldPath.Child("spec.StorageClaims.Resources.Requests"),
+				spec.StorageClaims, "spec.tiflash.storageClaims.resources[storage]: Required value."))
+		}
+	}
 	return allErrs
 }
 
diff --git a/pkg/apis/pingcap/v1alpha1/validation/validation_test.go b/pkg/apis/pingcap/v1alpha1/validation/validation_test.go
index a40b6d5df1..27009b71e3 100644
--- a/pkg/apis/pingcap/v1alpha1/validation/validation_test.go
+++ b/pkg/apis/pingcap/v1alpha1/validation/validation_test.go
@@ -375,6 +375,62 @@ func TestValidatePumpSpec(t *testing.T) {
 	}
 }
 
+func TestValidateTiFlashSpec(t *testing.T) {
+	g := NewGomegaWithT(t)
+	tests := []struct {
+		name           string
+		replicas       int32
+		expectedErrors int
+		storageClaims  []v1alpha1.StorageClaim
+	}{
+		{
+			name:           "has storage request",
+			replicas:       1,
+			expectedErrors: 0,
+			storageClaims: []v1alpha1.StorageClaim{
+				{
+					Resources: corev1.ResourceRequirements{
+						Requests: corev1.ResourceList{
+							corev1.ResourceStorage: resource.MustParse("10G"),
+						},
+					},
+				},
+			},
+		},
+		{
+			name:           "no storage request",
+			replicas:       1,
+			expectedErrors: 3,
+			storageClaims: []v1alpha1.StorageClaim{
+				{
+					Resources: corev1.ResourceRequirements{
+						Requests: corev1.ResourceList{},
+					},
+				},
+				{
+					Resources: corev1.ResourceRequirements{
+						Requests: corev1.ResourceList{},
+					},
+				},
+				{
+					Resources: corev1.ResourceRequirements{
+						Requests: corev1.ResourceList{},
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tc := newTidbClusterWithTiflash()
+			tc.Spec.TiFlash.StorageClaims = tt.storageClaims
+			err := validateTiFlashSpec(tc.Spec.TiFlash, field.NewPath("spec", "tiflash"))
+			r := len(err)
+			g.Expect(r).Should(Equal(tt.expectedErrors))
+		})
+	}
+}
+
 func TestValidateRequestsStorage(t *testing.T) {
 	g := NewGomegaWithT(t)
 	tests := []struct {
@@ -542,6 +598,14 @@ func newTidbCluster() *v1alpha1.TidbCluster {
 	return tc
 }
 
+func newTidbClusterWithTiflash() *v1alpha1.TidbCluster {
+	tc := newTidbCluster()
+	tc.Spec.TiFlash = &v1alpha1.TiFlashSpec{
+		Replicas: 1,
+	}
+	return tc
+}
+
 func newService() *v1alpha1.ServiceSpec {
 	svc := &v1alpha1.ServiceSpec{}
 	return svc