diff --git a/controllers/apps/component_controller_test.go b/controllers/apps/component_controller_test.go
index 1beeb8fc318..b322172620f 100644
--- a/controllers/apps/component_controller_test.go
+++ b/controllers/apps/component_controller_test.go
@@ -380,32 +380,6 @@ var _ = Describe("Component Controller", func() {
 		}
 	}
 
-	testChangeReplicasFromZero := func(compName, compDefName string) {
-		var (
-			init   = int32(0)
-			target = int32(3)
-		)
-
-		createClusterObjV2(compName, compDefObj.Name, func(f *testapps.MockClusterFactory) {
-			f.SetReplicas(init)
-		})
-
-		By(fmt.Sprintf("change replicas to %d", target))
-		changeComponentReplicas(clusterKey, target)
-
-		By("checking the number of replicas in component and ITS as expected")
-		Eventually(testapps.CheckObj(&testCtx, compKey, func(g Gomega, comp *appsv1alpha1.Component) {
-			g.Expect(comp.Spec.Replicas).Should(Equal(target))
-			g.Expect(comp.Generation).Should(Equal(comp.Status.ObservedGeneration))
-		})).Should(Succeed())
-
-		By("checking the number of replicas in ITS as expected")
-		itsKey := compKey
-		Eventually(testapps.CheckObj(&testCtx, itsKey, func(g Gomega, its *workloads.InstanceSet) {
-			g.Expect(*its.Spec.Replicas).Should(Equal(target))
-		})).Should(Succeed())
-	}
-
 	testChangeReplicasToZero := func(compName, compDefName string) {
 		var (
 			init   = int32(3)
@@ -2134,9 +2108,16 @@ var _ = Describe("Component Controller", func() {
 		})
 
 		It("with component zero replicas", func() {
-			createClusterObjV2(defaultCompName, compDefName, func(f *testapps.MockClusterFactory) {
-				f.SetReplicas(0)
-			})
+			phase := appsv1alpha1.ClusterPhase("")
+			createClusterObjVx("", defaultCompName, compDefName, true,
+				func(f *testapps.MockClusterFactory) {
+					f.SetReplicas(0)
+				}, &phase)
+
+			By("checking the component status can't be reconciled well")
+			Eventually(testapps.CheckObj(&testCtx, compKey, func(g Gomega, comp *appsv1alpha1.Component) {
+				g.Expect(comp.Generation > comp.Status.ObservedGeneration).Should(BeTrue())
+			})).Should(Succeed())
 		})
 
 		It("with component services", func() {
@@ -2202,10 +2183,6 @@ var _ = Describe("Component Controller", func() {
 			testChangeReplicas(replicationCompName, replicationCompDefName)
 		})
 
-		It("scale-out from 0", func() {
-			testChangeReplicasFromZero(replicationCompName, replicationCompDefName)
-		})
-
 		It("scale-in to 0", func() {
 			testChangeReplicasToZero(replicationCompName, replicationCompDefName)
 		})
@@ -2340,10 +2317,6 @@ var _ = Describe("Component Controller", func() {
 				It("scale-in to 0 and PVCs should not been deleted", func() {
 					testHorizontalScale(compName, compDefObj.Name, 3, 0, appsv1alpha1.HScaleDataClonePolicyCloneVolume)
 				})
-
-				It("scale-out from 0 and should work well", func() {
-					testHorizontalScale(compName, compDefObj.Name, 0, 3, appsv1alpha1.HScaleDataClonePolicyCloneVolume)
-				})
 			})
 
 			Context(fmt.Sprintf("[comp: %s] scale-out after volume expansion", compName), func() {
diff --git a/controllers/apps/transformer_component_validation.go b/controllers/apps/transformer_component_validation.go
index 127ea77005d..6f1abbcf184 100644
--- a/controllers/apps/transformer_component_validation.go
+++ b/controllers/apps/transformer_component_validation.go
@@ -21,14 +21,17 @@ package apps
 
 import (
 	"fmt"
+	"math"
 
 	appsv1alpha1 "github.com/apecloud/kubeblocks/apis/apps/v1alpha1"
 	"github.com/apecloud/kubeblocks/pkg/controller/graph"
 )
 
-const (
-	defaultMinReplicas         int32 = 0
-	defaultMinReplicas4ScaleIn int32 = 1
+var (
+	defaultReplicasLimit = appsv1alpha1.ReplicasLimit{
+		MinReplicas: 1,
+		MaxReplicas: math.MaxInt32,
+	}
 )
 
 // componentValidationTransformer validates the consistency between spec & definition.
@@ -86,44 +89,19 @@ func validateEnabledLogConfigs(compDef *appsv1alpha1.ComponentDefinition, enable
 }
 
 func validateCompReplicas(comp *appsv1alpha1.Component, compDef *appsv1alpha1.ComponentDefinition) error {
-	if err := validateCompReplicasGeneral(comp, compDef); err != nil {
-		return err
+	replicasLimit := &defaultReplicasLimit
+	// always respect the replicas limit if set.
+	if compDef.Spec.ReplicasLimit != nil {
+		replicasLimit = compDef.Spec.ReplicasLimit
 	}
-	return validateCompReplicas4Runtime(comp, compDef)
-}
 
-func validateCompReplicasGeneral(comp *appsv1alpha1.Component, compDef *appsv1alpha1.ComponentDefinition) error {
-	if compDef.Spec.ReplicasLimit == nil {
-		return nil
-	}
 	replicas := comp.Spec.Replicas
-	replicasLimit := compDef.Spec.ReplicasLimit
 	if replicas >= replicasLimit.MinReplicas && replicas <= replicasLimit.MaxReplicas {
 		return nil
 	}
 	return replicasOutOfLimitError(replicas, *replicasLimit)
 }
 
-func validateCompReplicas4Runtime(comp *appsv1alpha1.Component, compDef *appsv1alpha1.ComponentDefinition) error {
-	minReplicas := func() int32 {
-		// always respect the replicas limit if it is set.
-		if compDef.Spec.ReplicasLimit != nil {
-			return compDef.Spec.ReplicasLimit.MinReplicas
-		}
-		// HACK: take observedGeneration == 0 as the provisioning.
-		if comp.Status.ObservedGeneration == 0 {
-			return defaultMinReplicas
-		}
-		return min(comp.Spec.Replicas, defaultMinReplicas4ScaleIn)
-	}()
-
-	replicas := comp.Spec.Replicas
-	if replicas < minReplicas {
-		return fmt.Errorf("replicas %d is less than required min replicas %d", replicas, minReplicas)
-	}
-	return nil
-}
-
 func replicasOutOfLimitError(replicas int32, replicasLimit appsv1alpha1.ReplicasLimit) error {
 	return fmt.Errorf("replicas %d out-of-limit [%d, %d]", replicas, replicasLimit.MinReplicas, replicasLimit.MaxReplicas)
 }