diff --git a/pkg/api/galaxy/constant/constant.go b/pkg/api/galaxy/constant/constant.go
index 748d537d..613df1fc 100644
--- a/pkg/api/galaxy/constant/constant.go
+++ b/pkg/api/galaxy/constant/constant.go
@@ -114,6 +114,10 @@ func ConvertReleasePolicy(policyStr string) ReleasePolicy {
 	}
 }
 
+func PolicyStr(policy ReleasePolicy) string {
+	return [...]string{"", Immutable, Never}[policy]
+}
+
 const (
 	ResourceKind = "FloatingIP"
 	ApiVersion   = "galaxy.k8s.io/v1alpha1"
diff --git a/pkg/ipam/schedulerplugin/floatingip_plugin.go b/pkg/ipam/schedulerplugin/floatingip_plugin.go
index bf467f71..29637c56 100644
--- a/pkg/ipam/schedulerplugin/floatingip_plugin.go
+++ b/pkg/ipam/schedulerplugin/floatingip_plugin.go
@@ -232,6 +232,9 @@ func (p *FloatingIPPlugin) getSubnet(pod *corev1.Pod) (sets.String, error) {
 		return subnets, nil
 	}
 	policy := parseReleasePolicy(&pod.ObjectMeta)
+	if !keyObj.Deployment() && !keyObj.StatefulSet() && !keyObj.TApp() && policy != constant.ReleasePolicyPodDelete {
+		return nil, fmt.Errorf("policy %s not supported for non deployment/tapp/sts app", constant.PolicyStr(policy))
+	}
 	var replicas int
 	var isPoolSizeDefined bool
 	if keyObj.Deployment() {
diff --git a/pkg/ipam/schedulerplugin/floatingip_plugin_test.go b/pkg/ipam/schedulerplugin/floatingip_plugin_test.go
index c99d6f8f..1fc309e4 100644
--- a/pkg/ipam/schedulerplugin/floatingip_plugin_test.go
+++ b/pkg/ipam/schedulerplugin/floatingip_plugin_test.go
@@ -130,6 +130,21 @@ func TestFilter(t *testing.T) {
 	}
 }
 
+func TestFilterForPodWithoutRef(t *testing.T) {
+	fipPlugin, stopChan, nodes := createPluginTestNodes(t)
+	defer func() { stopChan <- struct{}{} }()
+	filtered, failed, err := fipPlugin.Filter(CreateSimplePod("pod1", "ns1", nil), nodes)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := checkFilterResult(filtered, failed, []string{node3, node4}, []string{drainedNode, nodeHasNoIP}); err != nil {
+		t.Fatal(err)
+	}
+	if _, _, err = fipPlugin.Filter(CreateSimplePod("pod1", "ns1", immutableAnnotation), nodes); err == nil {
+		t.Fatalf("expect an error for non sts/deployment/tapp pod with policy immutable")
+	}
+}
+
 func TestAllocateIP(t *testing.T) {
 	fipPlugin, stopChan, _ := createPluginTestNodes(t)
 	defer func() { stopChan <- struct{}{} }()
diff --git a/pkg/ipam/schedulerplugin/resync.go b/pkg/ipam/schedulerplugin/resync.go
index 1822f1e9..845f2188 100644
--- a/pkg/ipam/schedulerplugin/resync.go
+++ b/pkg/ipam/schedulerplugin/resync.go
@@ -185,8 +185,8 @@ func (p *FloatingIPPlugin) resyncAllocatedIPs(ipam floatingip.IPAM, meta *resync
 					replicas = tapp.Spec.Replicas
 				}
 			} else {
-				glog.Warningf("unknow app type of key %s", obj.keyObj.KeyInDB)
-				continue
+				// release for other apps
+				appExist = false
 			}
 			if should, reason := p.shouldReleaseDuringResync(obj.keyObj, releasePolicy, appExist, replicas); should {
 				if err := releaseIP(ipam, key, fmt.Sprintf("%s during resyncing", reason)); err != nil {
diff --git a/pkg/ipam/schedulerplugin/testing/util.go b/pkg/ipam/schedulerplugin/testing/util.go
index 0e80dc33..cea68424 100644
--- a/pkg/ipam/schedulerplugin/testing/util.go
+++ b/pkg/ipam/schedulerplugin/testing/util.go
@@ -73,3 +73,16 @@ func CreateTAppPod(name, namespace string, annotations map[string]string) *corev
 	pod.OwnerReferences[0].Kind = "TApp"
 	return pod
 }
+
+func CreateSimplePod(name, namespace string, annotations map[string]string) *corev1.Pod {
+	pod := CreateStatefulSetPod(name+"-0", namespace, annotations)
+	pod.Name = name
+	pod.OwnerReferences = nil
+	return pod
+}
+
+func CreatePodWithKind(name, namespace, kind string, annotations map[string]string) *corev1.Pod {
+	pod := CreateStatefulSetPod(name, namespace, annotations)
+	pod.OwnerReferences[0].Kind = kind
+	return pod
+}
diff --git a/pkg/ipam/schedulerplugin/util/utils.go b/pkg/ipam/schedulerplugin/util/utils.go
index b4bf9e0c..239bf326 100644
--- a/pkg/ipam/schedulerplugin/util/utils.go
+++ b/pkg/ipam/schedulerplugin/util/utils.go
@@ -122,6 +122,9 @@ const (
 	DeploymentPrefixKey  = "dp_"
 	StatefulsetPrefixKey = "sts_"
 	TAppPrefixKey        = "tapp_"
+
+	NoRefAppName       = "NULL"
+	NoRefAppTypePrefix = "NULL_"
 )
 
 func FormatKey(pod *corev1.Pod) (*KeyObj, error) {
@@ -131,22 +134,28 @@ func FormatKey(pod *corev1.Pod) (*KeyObj, error) {
 		PodName:   pod.Name,
 		Namespace: pod.Namespace}
 	if len(pod.OwnerReferences) == 0 {
-		return keyObj, fmt.Errorf("doesn't support pods which does not have parent app")
-	}
-	if pod.OwnerReferences[0].Kind == "StatefulSet" {
-		keyObj.AppName = pod.OwnerReferences[0].Name
-		keyObj.AppTypePrefix = StatefulsetPrefixKey
-	} else if pod.OwnerReferences[0].Kind == "TApp" {
-		keyObj.AppName = pod.OwnerReferences[0].Name
-		keyObj.AppTypePrefix = TAppPrefixKey
+		keyObj.AppName = NoRefAppName
+		keyObj.AppTypePrefix = NoRefAppTypePrefix
 	} else {
-		deploymentName := resolveDeploymentName(pod)
-		if deploymentName == "" {
-			return keyObj, fmt.Errorf("unsupported app type")
+		if pod.OwnerReferences[0].Kind == "StatefulSet" {
+			keyObj.AppName = pod.OwnerReferences[0].Name
+			keyObj.AppTypePrefix = StatefulsetPrefixKey
+		} else if pod.OwnerReferences[0].Kind == "TApp" {
+			keyObj.AppName = pod.OwnerReferences[0].Name
+			keyObj.AppTypePrefix = TAppPrefixKey
+		} else if pod.OwnerReferences[0].Kind != "ReplicaSet" {
+			// some app type galaxy can't recognize
+			keyObj.AppName = pod.OwnerReferences[0].Name
+			keyObj.AppTypePrefix = strings.ToLower(pod.OwnerReferences[0].Kind) + "_"
+		} else {
+			deploymentName := resolveDeploymentName(pod)
+			if deploymentName == "" {
+				return keyObj, fmt.Errorf("unsupported app type")
+			}
+			keyObj.AppName = deploymentName
+			// treat rs like deployment, share the same appPrefixKey
+			keyObj.AppTypePrefix = DeploymentPrefixKey
 		}
-		keyObj.AppName = deploymentName
-		// treat rs like deployment, share the same appPrefixKey
-		keyObj.AppTypePrefix = DeploymentPrefixKey
 	}
 	keyObj.genKey()
 	return keyObj, nil
@@ -166,26 +175,19 @@ func ParseKey(key string) *KeyObj {
 		keyObj.PoolName = parts[0]
 		removedPoolKey = parts[1]
 	}
-	if strings.HasPrefix(removedPoolKey, DeploymentPrefixKey) {
-		keyObj.AppTypePrefix = DeploymentPrefixKey
-	} else if strings.HasPrefix(removedPoolKey, StatefulsetPrefixKey) {
-		keyObj.AppTypePrefix = StatefulsetPrefixKey
-	} else if strings.HasPrefix(removedPoolKey, TAppPrefixKey) {
-		keyObj.AppTypePrefix = TAppPrefixKey
-	}
-	keyObj.AppName, keyObj.PodName, keyObj.Namespace = resolvePodKey(removedPoolKey)
+	keyObj.AppTypePrefix, keyObj.AppName, keyObj.PodName, keyObj.Namespace = resolvePodKey(removedPoolKey)
 	return keyObj
 }
 
 // resolvePodKey returns appname, podName, namespace
-// "sts_kube-system_fip-bj_fip-bj-111": {"fip-bj", "fip-bj-111", "kube-system"}
-func resolvePodKey(key string) (string, string, string) {
+// "sts_kube-system_fip-bj_fip-bj-111": {"sts_", "fip-bj", "fip-bj-111", "kube-system"}
+func resolvePodKey(key string) (string, string, string, string) {
 	// _ is not a valid char in appname
 	parts := strings.Split(key, "_")
 	if len(parts) == 4 {
-		return parts[2], parts[3], parts[1]
+		return parts[0] + "_", parts[2], parts[3], parts[1]
 	}
-	return "", "", ""
+	return "", "", "", ""
 }
 
 func Join(name, namespace string) string {
diff --git a/pkg/ipam/schedulerplugin/util/utils_test.go b/pkg/ipam/schedulerplugin/util/utils_test.go
index 555232e6..99ecf9d7 100644
--- a/pkg/ipam/schedulerplugin/util/utils_test.go
+++ b/pkg/ipam/schedulerplugin/util/utils_test.go
@@ -28,20 +28,24 @@ import (
 
 func TestResolvePodKey(t *testing.T) {
 	tests := map[string][]string{
-		"dp_default_dp1_dp1-rs1-pod1":           {"default", "dp1", "dp1-rs1-pod1"},
-		"sts_default_fip_fip-0":                 {"default", "fip", "fip-0"},
-		"sts_kube-system_fip-bj_fip-bj-111":     {"kube-system", "fip-bj", "fip-bj-111"},
-		"tapp_kube-system_tapp-bj_tapp-bj-2091": {"kube-system", "tapp-bj", "tapp-bj-2091"},
+		"dp_default_dp1_dp1-rs1-pod1":           {"dp_", "default", "dp1", "dp1-rs1-pod1"},
+		"sts_default_fip_fip-0":                 {"sts_", "default", "fip", "fip-0"},
+		"sts_kube-system_fip-bj_fip-bj-111":     {"sts_", "kube-system", "fip-bj", "fip-bj-111"},
+		"tapp_kube-system_tapp-bj_tapp-bj-2091": {"tapp_", "kube-system", "tapp-bj", "tapp-bj-2091"},
+		"NULL_default_NULL_pod1":                {"NULL_", "default", "NULL", "pod1"},
 	}
 	for k, v := range tests {
-		appname, podName, namespace := resolvePodKey(k)
-		if namespace != v[0] {
+		apptype, appname, podName, namespace := resolvePodKey(k)
+		if apptype != v[0] {
+			t.Fatal(apptype)
+		}
+		if namespace != v[1] {
 			t.Fatal(namespace)
 		}
-		if appname != v[1] {
+		if appname != v[2] {
 			t.Fatal(appname)
 		}
-		if podName != v[2] {
+		if podName != v[3] {
 			t.Fatal(podName)
 		}
 	}
@@ -78,7 +82,7 @@ func TestFormatKey(t *testing.T) {
 				PoolName:      "pl1",
 			},
 			expectPoolPrefix:    "pool__pl1_",
-			expectPoolAppPrefix: "pool__pl1_sts_ns1_sts",
+			expectPoolAppPrefix: "pool__pl1_sts_ns1_sts_",
 		},
 		{
 			pod: CreateDeploymentPod("dp-xxx-yyy", "ns1", nil),
@@ -130,7 +134,33 @@ func TestFormatKey(t *testing.T) {
 				PoolName:      "pl1",
 			},
 			expectPoolPrefix:    "pool__pl1_",
-			expectPoolAppPrefix: "pool__pl1_tapp_ns1_tapp",
+			expectPoolAppPrefix: "pool__pl1_tapp_ns1_tapp_",
+		},
+		{
+			pod: CreateSimplePod("pod1", "ns1", nil),
+			expect: KeyObj{
+				KeyInDB:       "NULL_ns1_NULL_pod1",
+				AppTypePrefix: "NULL_",
+				AppName:       "NULL",
+				PodName:       "pod1",
+				Namespace:     "ns1",
+				PoolName:      "",
+			},
+			expectPoolPrefix:    "NULL_ns1_NULL_",
+			expectPoolAppPrefix: "NULL_ns1_NULL_",
+		},
+		{
+			pod: CreatePodWithKind("worker-1", "ns1", "spark", nil),
+			expect: KeyObj{
+				KeyInDB:       "spark_ns1_worker_worker-1",
+				AppTypePrefix: "spark_",
+				AppName:       "worker",
+				PodName:       "worker-1",
+				Namespace:     "ns1",
+				PoolName:      "",
+			},
+			expectPoolPrefix:    "spark_ns1_worker_",
+			expectPoolAppPrefix: "spark_ns1_worker_",
 		},
 	}
 	for i := range testCases {
@@ -145,6 +175,9 @@ func TestFormatKey(t *testing.T) {
 		if testCase.expectPoolPrefix != got.PoolPrefix() {
 			t.Errorf("case %d, expect %+v, got %+v", i, testCase.expectPoolPrefix, got.PoolPrefix())
 		}
+		if testCase.expectPoolAppPrefix != got.PoolAppPrefix() {
+			t.Errorf("case %d, expect %+v, got %+v", i, testCase.expectPoolAppPrefix, got.PoolAppPrefix())
+		}
 	}
 }
 
@@ -310,6 +343,19 @@ func TestParseKey(t *testing.T) {
 			},
 			expectPoolPrefix: "tapp_ns1_demo_",
 		},
+		// unknown app type
+		{
+			keyInDB: "spark_ns1_worker_worker-1",
+			expect: KeyObj{
+				KeyInDB:       "spark_ns1_worker_worker-1",
+				AppTypePrefix: "spark_",
+				AppName:       "worker",
+				PodName:       "worker-1",
+				Namespace:     "ns1",
+				PoolName:      "",
+			},
+			expectPoolPrefix: "spark_ns1_worker_",
+		},
 	}
 	for i := range testCases {
 		testCase := testCases[i]