diff --git a/apis/apps/v1alpha1/clusterdefinition_types.go b/apis/apps/v1alpha1/clusterdefinition_types.go
index 1a1c974aeb0..a50e1d780ab 100644
--- a/apis/apps/v1alpha1/clusterdefinition_types.go
+++ b/apis/apps/v1alpha1/clusterdefinition_types.go
@@ -50,6 +50,7 @@ type ClusterDefinitionSpec struct {
 	// Existing usage should be updated to the current preferred approach to avoid compatibility issues in future releases.
 	//
 	// +kubebuilder:deprecatedversion:warning="This field has been deprecated since 0.9.0"
+	// +kubebuilder:default={}
 	// +patchMergeKey=name
 	// +patchStrategy=merge,retainKeys
 	// +listType=map
diff --git a/config/crd/bases/apps.kubeblocks.io_clusterdefinitions.yaml b/config/crd/bases/apps.kubeblocks.io_clusterdefinitions.yaml
index 7abf927a0f7..8b48de72909 100644
--- a/config/crd/bases/apps.kubeblocks.io_clusterdefinitions.yaml
+++ b/config/crd/bases/apps.kubeblocks.io_clusterdefinitions.yaml
@@ -72,6 +72,7 @@ spec:
             description: ClusterDefinitionSpec defines the desired state of ClusterDefinition.
             properties:
               componentDefs:
+                default: []
                 description: |-
                   Provides the definitions for the cluster components.
 
diff --git a/deploy/helm/crds/apps.kubeblocks.io_clusterdefinitions.yaml b/deploy/helm/crds/apps.kubeblocks.io_clusterdefinitions.yaml
index 7abf927a0f7..8b48de72909 100644
--- a/deploy/helm/crds/apps.kubeblocks.io_clusterdefinitions.yaml
+++ b/deploy/helm/crds/apps.kubeblocks.io_clusterdefinitions.yaml
@@ -72,6 +72,7 @@ spec:
             description: ClusterDefinitionSpec defines the desired state of ClusterDefinition.
             properties:
               componentDefs:
+                default: []
                 description: |-
                   Provides the definitions for the cluster components.