diff --git a/pkg/controller/sidecarset/sidecarset_processor.go b/pkg/controller/sidecarset/sidecarset_processor.go
index 0d50e31553..bac2b832ed 100644
--- a/pkg/controller/sidecarset/sidecarset_processor.go
+++ b/pkg/controller/sidecarset/sidecarset_processor.go
@@ -155,7 +155,13 @@ func (p *Processor) UpdateSidecarSet(sidecarSet *appsv1alpha1.SidecarSet) (recon
 func (p *Processor) updatePods(control sidecarcontrol.SidecarControl, pods []*corev1.Pod) error {
 	sidecarset := control.GetSidecarset()
 	// compute next updated pods based on the sidecarset upgrade strategy
-	upgradePods := NewStrategy().GetNextUpgradePods(control, pods)
+	upgradePods, notUpgradablePods := NewStrategy().GetNextUpgradePods(control, pods)
+	if len(notUpgradablePods) > 0 {
+		// send event for pods that are not upgradable, so that user can know the reason
+		for _, pod := range notUpgradablePods {
+			p.recorder.Eventf(pod, corev1.EventTypeNormal, "SidecarSetNotUpgradable", "SidecarSet %s is not upgradable for this pod", sidecarset.Name)
+		}
+	}
 	if len(upgradePods) == 0 {
 		klog.V(3).Infof("sidecarSet next update is nil, skip this round, name: %s", sidecarset.Name)
 		return nil
diff --git a/pkg/controller/sidecarset/sidecarset_strategy.go b/pkg/controller/sidecarset/sidecarset_strategy.go
index edb14d0295..81ae25d590 100644
--- a/pkg/controller/sidecarset/sidecarset_strategy.go
+++ b/pkg/controller/sidecarset/sidecarset_strategy.go
@@ -22,7 +22,8 @@ type Strategy interface {
 	//2. Sort Pods with default sequence
 	//3. sort waitUpdateIndexes based on the scatter rules
 	//4. calculate max count of pods can update with maxUnavailable
-	GetNextUpgradePods(control sidecarcontrol.SidecarControl, pods []*corev1.Pod) []*corev1.Pod
+	//5. also return the pods that are not upgradable
+	GetNextUpgradePods(control sidecarcontrol.SidecarControl, pods []*corev1.Pod) (upgradePods []*corev1.Pod, notUpgradablePods []*corev1.Pod)
 }
 
 type spreadingStrategy struct{}
@@ -35,10 +36,12 @@ func NewStrategy() Strategy {
 	return globalSpreadingStrategy
 }
 
-func (p *spreadingStrategy) GetNextUpgradePods(control sidecarcontrol.SidecarControl, pods []*corev1.Pod) (upgradePods []*corev1.Pod) {
+func (p *spreadingStrategy) GetNextUpgradePods(control sidecarcontrol.SidecarControl, pods []*corev1.Pod) (upgradePods []*corev1.Pod, notUpgradablePods []*corev1.Pod) {
 	sidecarset := control.GetSidecarset()
 	// wait to upgrade pod index
 	var waitUpgradedIndexes []int
+	// the pod that are not upgradable, will be skipped
+	var notUpgradableIndexes []int
 	strategy := sidecarset.Spec.UpdateStrategy
 
 	// If selector is not nil, check whether the pods is selected to upgrade
@@ -68,12 +71,16 @@ func (p *spreadingStrategy) GetNextUpgradePods(control sidecarcontrol.SidecarCon
 	//  * It is to determine whether there are other fields that have been modified for pod.
 	for index, pod := range pods {
 		isUpdated := sidecarcontrol.IsPodSidecarUpdated(sidecarset, pod)
-		if !isUpdated && isSelected(pod) && control.IsSidecarSetUpgradable(pod) {
-			waitUpgradedIndexes = append(waitUpgradedIndexes, index)
+		if !isUpdated && isSelected(pod) {
+			if control.IsSidecarSetUpgradable(pod) {
+				waitUpgradedIndexes = append(waitUpgradedIndexes, index)
+			} else {
+				notUpgradableIndexes = append(notUpgradableIndexes, index)
+			}
 		}
 	}
 
-	klog.V(3).Infof("sidecarSet(%s) matchedPods(%d) waitUpdated(%d)", sidecarset.Name, len(pods), len(waitUpgradedIndexes))
+	klog.V(3).Infof("sidecarSet(%s) matchedPods(%d) waitUpdated(%d) notUpgradable(%d)", sidecarset.Name, len(pods), len(waitUpgradedIndexes), len(notUpgradableIndexes))
 	//2. sort Pods with default sequence and scatter
 	waitUpgradedIndexes = SortUpdateIndexes(strategy, pods, waitUpgradedIndexes)
 
@@ -87,6 +94,10 @@ func (p *spreadingStrategy) GetNextUpgradePods(control sidecarcontrol.SidecarCon
 	for _, idx := range waitUpgradedIndexes {
 		upgradePods = append(upgradePods, pods[idx])
 	}
+	// 5. pods that are not upgradable will not be skipped in the following process
+	for _, idx := range notUpgradableIndexes {
+		notUpgradablePods = append(notUpgradablePods, pods[idx])
+	}
 	return
 }