diff --git a/apis/placement/v1beta1/clusterresourceplacement_types.go b/apis/placement/v1beta1/clusterresourceplacement_types.go
index 4e614c223..9e280233f 100644
--- a/apis/placement/v1beta1/clusterresourceplacement_types.go
+++ b/apis/placement/v1beta1/clusterresourceplacement_types.go
@@ -340,6 +340,17 @@ type ClusterResourcePlacementStatus struct {
 	// +optional
 	SelectedResources []ResourceIdentifier `json:"selectedResources,omitempty"`
 
+	// ObservedResourceIndex is the resource index of a group of ClusterResourceSnapshot CR that the conditions in the
+	// ClusterResourcePlacementStatus observe. For example, a condition of `ClusterResourcePlacementSynchronized` type
+	// is observing the synchronization status of the resources in group of ClusterResourceSnapshot with the $ObservedResourceIndex.
+	// ClusterResourceSnapshot is used by the ClusterResourcePlacementStatus controller to store a snapshot of selected resources.
+	// A new resource index is generated each time a new snapshot is taken when the selected resources content changes.
+	// One resource snapshot can contain multiple clusterResourceSnapshots CRs in order to store large amount of resources.
+	// One can find all the clusterResourceSnapshot with the observed resource index by
+	// `kubectl get ClusterResourceSnapshot --selector=kubernetes-fleet.io/resource-index=$ObservedResourceIndex `
+	// +optional
+	ObservedResourceIndex string `json:"observedResourceSnapshots,omitempty"`
+
 	// PlacementStatuses contains a list of placement status on the clusters that are selected by PlacementPolicy.
 	// Each selected cluster according to the latest resource placement is guaranteed to have a corresponding placementStatuses.
 	// In the pickN case, there are N placement statuses where N = NumberOfClusters; Or in the pickFixed case, there are
@@ -419,6 +430,10 @@ type ResourcePlacementStatus struct {
 	// +optional
 	ClusterName string `json:"clusterName,omitempty"`
 
+	// ResourceIndex is the index of the resource snapshot group
+	// +optional
+	ResourceIndex *int `json:"ResourceIndex,omitempty"`
+
 	// +kubebuilder:validation:MaxItems=100
 
 	// FailedResourcePlacements is a list of all the resources failed to be placed to the given cluster.
diff --git a/config/crd/bases/placement.kubernetes-fleet.io_clusterresourceplacements.yaml b/config/crd/bases/placement.kubernetes-fleet.io_clusterresourceplacements.yaml
index b1440430a..515ea6bbb 100644
--- a/config/crd/bases/placement.kubernetes-fleet.io_clusterresourceplacements.yaml
+++ b/config/crd/bases/placement.kubernetes-fleet.io_clusterresourceplacements.yaml
@@ -552,6 +552,21 @@ spec:
                 x-kubernetes-list-map-keys:
                 - type
                 x-kubernetes-list-type: map
+              observedResourceSnapshots:
+                description: ObservedResourceIndex is the resource index of a group
+                  of ClusterResourceSnapshot CR that the conditions in the ClusterResourcePlacementStatus
+                  observe. For example, a condition of `ClusterResourcePlacementSynchronized`
+                  type is observing the synchronization status of the resources in
+                  group of ClusterResourceSnapshot with the $ObservedResourceIndex.
+                  ClusterResourceSnapshot is used by the ClusterResourcePlacementStatus
+                  controller to store a snapshot of selected resources. A new resource
+                  index is generated each time a new snapshot is taken when the selected
+                  resources content changes. One resource snapshot can contain multiple
+                  clusterResourceSnapshots CRs in order to store large amount of resources.
+                  One can find all the clusterResourceSnapshot with the observed resource
+                  index by `kubectl get ClusterResourceSnapshot --selector=kubernetes-fleet.io/resource-index=$ObservedResourceIndex
+                  `
+                type: string
               placementStatuses:
                 description: PlacementStatuses contains a list of placement status
                   on the clusters that are selected by PlacementPolicy. Each selected
@@ -566,6 +581,10 @@ spec:
                   description: ResourcePlacementStatus represents the placement status
                     of selected resources for one target cluster.
                   properties:
+                    ResourceIndex:
+                      description: ResourceIndex is the index of the resource snapshot
+                        group
+                      type: integer
                     clusterName:
                       description: ClusterName is the name of the cluster this resource
                         is assigned to. If it is not empty, its value should be unique