diff --git a/pkg/controller.v1alpha3/consts/const.go b/pkg/controller.v1alpha3/consts/const.go
index 9eea03b3a22..ff07bc7cc59 100644
--- a/pkg/controller.v1alpha3/consts/const.go
+++ b/pkg/controller.v1alpha3/consts/const.go
@@ -37,6 +37,8 @@ const (
 
 	// DefaultKatibNamespaceEnvName is the default env name of katib namespace
 	DefaultKatibNamespaceEnvName = "KATIB_CORE_NAMESPACE"
+	// DefaultKatibComposerEnvName is the default env name of katib suggestion composer
+	DefaultKatibComposerEnvName = "KATIB_SUGGESTION_COMPOSER"
 
 	// KatibConfigMapName is the config map constants
 	// Configmap name which includes Katib's configuration
@@ -102,17 +104,10 @@ const (
 	// JobKindPyTorch is the kind of PyTorchJob.
 	JobKindPyTorch = "PyTorchJob"
 
-	// JobVersionJob is the api version of Kubernetes Job.
-	JobVersionJob = "v1"
-	// JobVersionTF is the api version of TFJob.
-	JobVersionTF = "v1"
-	// JobVersionPyTorch is the api version of PyTorchJob.
-	JobVersionPyTorch = "v1"
-
-	// JobGroupJob is the group name of Kubernetes Job.
-	JobGroupJob = "batch"
-	// JobGroupKubeflow is the group name of Kubeflow.
-	JobGroupKubeflow = "kubeflow.org"
+	// built-in JobRoles
+	JobRole        = "job-role"
+	JobRoleTF      = "tf-job-role"
+	JobRolePyTorch = "pytorch-job-role"
 
 	// AnnotationIstioSidecarInjectName is the annotation of Istio Sidecar
 	AnnotationIstioSidecarInjectName = "sidecar.istio.io/inject"
@@ -124,4 +119,6 @@ const (
 var (
 	// DefaultKatibNamespace is the default namespace of katib deployment.
 	DefaultKatibNamespace = env.GetEnvOrDefault(DefaultKatibNamespaceEnvName, "kubeflow")
+	// DefaultComposer is the default composer of katib suggestion.
+	DefaultComposer = env.GetEnvOrDefault(DefaultKatibComposerEnvName, "General")
 )
diff --git a/pkg/controller.v1alpha3/suggestion/composer/composer.go b/pkg/controller.v1alpha3/suggestion/composer/composer.go
index c8f4e8428a8..8fa7bdc18b5 100644
--- a/pkg/controller.v1alpha3/suggestion/composer/composer.go
+++ b/pkg/controller.v1alpha3/suggestion/composer/composer.go
@@ -11,6 +11,7 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
+	"sigs.k8s.io/controller-runtime/pkg/manager"
 	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
 
 	suggestionsv1alpha3 "github.com/kubeflow/katib/pkg/apis/controller/suggestions/v1alpha3"
@@ -28,11 +29,15 @@ const (
 	defaultGRPCHealthCheckProbe = "/bin/grpc_health_probe"
 )
 
-var log = logf.Log.WithName("suggestion-composer")
+var (
+	log              = logf.Log.WithName("suggestion-composer")
+	ComposerRegistry = make(map[string]Composer)
+)
 
 type Composer interface {
 	DesiredDeployment(s *suggestionsv1alpha3.Suggestion) (*appsv1.Deployment, error)
 	DesiredService(s *suggestionsv1alpha3.Suggestion) (*corev1.Service, error)
+	CreateComposer(mgr manager.Manager) Composer
 }
 
 type General struct {
@@ -40,11 +45,10 @@ type General struct {
 	client.Client
 }
 
-func New(scheme *runtime.Scheme, client client.Client) Composer {
-	return &General{
-		scheme: scheme,
-		Client: client,
-	}
+func New(mgr manager.Manager) Composer {
+	// We assume DefaultComposer always exists in ComposerRegistry.
+	ptr, _ := ComposerRegistry[consts.DefaultComposer]
+	return ptr.CreateComposer(mgr)
 }
 
 func (g *General) DesiredDeployment(s *suggestionsv1alpha3.Suggestion) (*appsv1.Deployment, error) {
@@ -208,3 +212,11 @@ func (g *General) desiredContainer(s *suggestionsv1alpha3.Suggestion) (*corev1.C
 	}
 	return c, nil
 }
+
+func (g *General) CreateComposer(mgr manager.Manager) Composer {
+	return &General{mgr.GetScheme(), mgr.GetClient()}
+}
+
+func init() {
+	ComposerRegistry[consts.DefaultComposer] = &General{}
+}
diff --git a/pkg/controller.v1alpha3/suggestion/suggestion_controller.go b/pkg/controller.v1alpha3/suggestion/suggestion_controller.go
index 6564f5d485b..6194d0fd24a 100644
--- a/pkg/controller.v1alpha3/suggestion/suggestion_controller.go
+++ b/pkg/controller.v1alpha3/suggestion/suggestion_controller.go
@@ -62,7 +62,7 @@ func newReconciler(mgr manager.Manager) reconcile.Reconciler {
 		Client:           mgr.GetClient(),
 		SuggestionClient: suggestionclient.New(),
 		scheme:           mgr.GetScheme(),
-		Composer:         composer.New(mgr.GetScheme(), mgr.GetClient()),
+		Composer:         composer.New(mgr),
 		recorder:         mgr.GetRecorder(ControllerName),
 	}
 }
diff --git a/pkg/controller.v1alpha3/trial/trial_controller.go b/pkg/controller.v1alpha3/trial/trial_controller.go
index c43ac23a450..37dc3c5bc3e 100644
--- a/pkg/controller.v1alpha3/trial/trial_controller.go
+++ b/pkg/controller.v1alpha3/trial/trial_controller.go
@@ -106,7 +106,7 @@ func add(mgr manager.Manager, r reconcile.Reconciler) error {
 		return err
 	}
 
-	for _, gvk := range jobv1alpha3.GetSupportedJobList() {
+	for _, gvk := range jobv1alpha3.SupportedJobList {
 		unstructuredJob := &unstructured.Unstructured{}
 		unstructuredJob.SetGroupVersionKind(gvk)
 		err = c.Watch(
@@ -274,6 +274,15 @@ func (r *ReconcileTrial) reconcileJob(instance *trialsv1alpha3.Trial, desiredJob
 			if instance.IsCompleted() {
 				return nil, nil
 			}
+			jobProvider, err := jobv1alpha3.New(desiredJob.GetKind())
+			if err != nil {
+				return nil, err
+			}
+			// mutate desiredJob according to provider
+			if err := jobProvider.MutateJob(instance, desiredJob); err != nil {
+				logger.Error(err, "Mutating desiredSpec of km.Training error")
+				return nil, err
+			}
 			logger.Info("Creating Job", "kind", kind,
 				"name", desiredJob.GetName())
 			err = r.Create(context.TODO(), desiredJob)
diff --git a/pkg/job/v1alpha3/consts.go b/pkg/job/v1alpha3/consts.go
deleted file mode 100644
index 5010b415cea..00000000000
--- a/pkg/job/v1alpha3/consts.go
+++ /dev/null
@@ -1,48 +0,0 @@
-package v1alpha3
-
-import (
-	"github.com/kubeflow/katib/pkg/controller.v1alpha3/consts"
-	"k8s.io/apimachinery/pkg/runtime/schema"
-)
-
-const (
-	// JobNameLabel represents the label key for the job name, the value is job name
-	JobNameLabel = "job-name"
-	// JobRoleLabel represents the label key for the job role, e.g. the value is master
-	JobRoleLabel = "job-role"
-	// TFJobRoleLabel is deprecated in kubeflow 0.7, but we need to be compatible.
-	TFJobRoleLabel = "tf-job-role"
-	// PyTorchJobRoleLabel is deprecated in kubeflow 0.7, but we need to be compatible.
-	PyTorchJobRoleLabel = "pytorch-job-role"
-)
-
-// JobRoleMap is the map which is used to determin if the replica is master.
-// Katib will inject metrics collector into master replica.
-var JobRoleMap = map[string][]string{
-	// Job kind does not support distributed training, thus no master.
-	consts.JobKindJob:     {},
-	consts.JobKindTF:      {JobRoleLabel, TFJobRoleLabel},
-	consts.JobKindPyTorch: {JobRoleLabel, PyTorchJobRoleLabel},
-}
-
-// GetSupportedJobList returns the list of the supported jobs' GVK.
-func GetSupportedJobList() []schema.GroupVersionKind {
-	supportedJobList := []schema.GroupVersionKind{
-		{
-			Group:   consts.JobGroupJob,
-			Version: consts.JobVersionJob,
-			Kind:    consts.JobKindJob,
-		},
-		{
-			Group:   consts.JobGroupKubeflow,
-			Version: consts.JobVersionTF,
-			Kind:    consts.JobKindTF,
-		},
-		{
-			Group:   consts.JobGroupKubeflow,
-			Version: consts.JobVersionPyTorch,
-			Kind:    consts.JobKindPyTorch,
-		},
-	}
-	return supportedJobList
-}
diff --git a/pkg/job/v1alpha3/job/job.go b/pkg/job/v1alpha3/job.go
similarity index 68%
rename from pkg/job/v1alpha3/job/job.go
rename to pkg/job/v1alpha3/job.go
index 1574383ed2f..063fba0bc4e 100644
--- a/pkg/job/v1alpha3/job/job.go
+++ b/pkg/job/v1alpha3/job.go
@@ -1,4 +1,4 @@
-package job
+package v1alpha3
 
 import (
 	commonv1 "github.com/kubeflow/tf-operator/pkg/apis/common/v1"
@@ -6,11 +6,15 @@ import (
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
 	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
+
+	"github.com/kubeflow/katib/pkg/apis/controller/trials/v1alpha3"
+	"github.com/kubeflow/katib/pkg/controller.v1alpha3/consts"
 )
 
 var (
-	log = logf.Log.WithName("provider-job")
+	jobLogger = logf.Log.WithName("provider-job")
 )
 
 // Job is the provider of Job kind.
@@ -25,12 +29,12 @@ func (j Job) GetDeployedJobStatus(
 	status, ok, unerr := unstructured.NestedFieldCopy(deployedJob.Object, "status")
 	if !ok {
 		if unerr != nil {
-			log.Error(unerr, "NestedFieldCopy unstructured to status error")
+			jobLogger.Error(unerr, "NestedFieldCopy unstructured to status error")
 			return nil, unerr
 		}
 		// Job does not have the running condition in status, thus we think
 		// the job is running when it is created.
-		log.Info("NestedFieldCopy", "err", "status cannot be found in job")
+		jobLogger.Info("NestedFieldCopy", "err", "status cannot be found in job")
 		return nil, nil
 	}
 
@@ -38,7 +42,7 @@ func (j Job) GetDeployedJobStatus(
 	jobStatus := batchv1.JobStatus{}
 	err := runtime.DefaultUnstructuredConverter.FromUnstructured(statusMap, &jobStatus)
 	if err != nil {
-		log.Error(err, "Convert unstructured to status error")
+		jobLogger.Error(err, "Convert unstructured to status error")
 		return nil, err
 	}
 	for _, cond := range jobStatus.Conditions {
@@ -65,3 +69,20 @@ func (j Job) IsTrainingContainer(index int, c corev1.Container) bool {
 	}
 	return false
 }
+func (j Job) MutateJob(*v1alpha3.Trial, *unstructured.Unstructured) error {
+	return nil
+}
+
+func (j *Job) Create(kind string) Provider {
+	return &Job{}
+}
+
+func init() {
+	ProviderRegistry[consts.JobKindJob] = &Job{}
+	SupportedJobList[consts.JobKindJob] = schema.GroupVersionKind{
+		Group:   "batch",
+		Version: "v1",
+		Kind:    consts.JobKindJob,
+	}
+	JobRoleMap[consts.JobKindJob] = []string{}
+}
diff --git a/pkg/job/v1alpha3/kubeflow/kubeflow.go b/pkg/job/v1alpha3/kubeflow.go
similarity index 61%
rename from pkg/job/v1alpha3/kubeflow/kubeflow.go
rename to pkg/job/v1alpha3/kubeflow.go
index 686bb46446f..2c9c539236a 100644
--- a/pkg/job/v1alpha3/kubeflow/kubeflow.go
+++ b/pkg/job/v1alpha3/kubeflow.go
@@ -1,20 +1,21 @@
-package kubeflow
+package v1alpha3
 
 import (
 	pytorchv1 "github.com/kubeflow/pytorch-operator/pkg/apis/pytorch/v1"
 	commonv1 "github.com/kubeflow/tf-operator/pkg/apis/common/v1"
 	tfv1 "github.com/kubeflow/tf-operator/pkg/apis/tensorflow/v1"
-
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
 	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
 
+	"github.com/kubeflow/katib/pkg/apis/controller/trials/v1alpha3"
 	"github.com/kubeflow/katib/pkg/controller.v1alpha3/consts"
 )
 
 var (
-	log = logf.Log.WithName("provider-kubeflow")
+	kfLogger = logf.Log.WithName("provider-kubeflow")
 )
 
 // Kubeflow is the provider of Kubeflow kinds.
@@ -31,10 +32,10 @@ func (k Kubeflow) GetDeployedJobStatus(
 	status, ok, unerr := unstructured.NestedFieldCopy(deployedJob.Object, "status")
 	if !ok {
 		if unerr != nil {
-			log.Error(unerr, "NestedFieldCopy unstructured to status error")
+			kfLogger.Error(unerr, "NestedFieldCopy unstructured to status error")
 			return nil, unerr
 		}
-		log.Info("NestedFieldCopy unstructured to status error",
+		kfLogger.Info("NestedFieldCopy unstructured to status error",
 			"err", "Status is not found in job")
 		return nil, nil
 	}
@@ -43,7 +44,7 @@ func (k Kubeflow) GetDeployedJobStatus(
 	jobStatus := commonv1.JobStatus{}
 	err := runtime.DefaultUnstructuredConverter.FromUnstructured(statusMap, &jobStatus)
 	if err != nil {
-		log.Error(err, "Convert unstructured to status error")
+		kfLogger.Error(err, "Convert unstructured to status error")
 		return nil, err
 	}
 	// Get the latest condition and set it to jobCondition.
@@ -70,8 +71,33 @@ func (k Kubeflow) IsTrainingContainer(index int, c corev1.Container) bool {
 			return true
 		}
 	default:
-		log.Info("Invalid Katib worker kind", "JobKind", k.Kind)
+		kfLogger.Info("Invalid Katib worker kind", "JobKind", k.Kind)
 		return false
 	}
 	return false
 }
+
+func (k Kubeflow) MutateJob(*v1alpha3.Trial, *unstructured.Unstructured) error {
+	return nil
+}
+
+func (k *Kubeflow) Create(kind string) Provider {
+	return &Kubeflow{Kind: kind}
+}
+
+func init() {
+	ProviderRegistry[consts.JobKindTF] = &Kubeflow{}
+	SupportedJobList[consts.JobKindTF] = schema.GroupVersionKind{
+		Group:   "kubeflow.org",
+		Version: "v1",
+		Kind:    consts.JobKindTF,
+	}
+	JobRoleMap[consts.JobKindTF] = []string{consts.JobRole, consts.JobRoleTF}
+	ProviderRegistry[consts.JobKindPyTorch] = &Kubeflow{}
+	SupportedJobList[consts.JobKindPyTorch] = schema.GroupVersionKind{
+		Group:   "kubeflow.org",
+		Version: "v1",
+		Kind:    consts.JobKindPyTorch,
+	}
+	JobRoleMap[consts.JobKindPyTorch] = []string{consts.JobRole, consts.JobRolePyTorch}
+}
diff --git a/pkg/job/v1alpha3/provider.go b/pkg/job/v1alpha3/provider.go
index 1326479fcf8..4daa137c0b1 100644
--- a/pkg/job/v1alpha3/provider.go
+++ b/pkg/job/v1alpha3/provider.go
@@ -3,13 +3,21 @@ package v1alpha3
 import (
 	"fmt"
 
+	commonv1 "github.com/kubeflow/tf-operator/pkg/apis/common/v1"
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
 
-	"github.com/kubeflow/katib/pkg/controller.v1alpha3/consts"
-	"github.com/kubeflow/katib/pkg/job/v1alpha3/job"
-	"github.com/kubeflow/katib/pkg/job/v1alpha3/kubeflow"
-	commonv1 "github.com/kubeflow/tf-operator/pkg/apis/common/v1"
+	"github.com/kubeflow/katib/pkg/apis/controller/trials/v1alpha3"
+)
+
+var (
+	ProviderRegistry = make(map[string]Provider)
+	// JobRoleMap is the map which is used to determin if the replica is master.
+	// Katib will inject metrics collector into master replica.
+	JobRoleMap = make(map[string][]string)
+	// SupportedJobList returns the list of the supported jobs' GVK.
+	SupportedJobList = make(map[string]schema.GroupVersionKind)
 )
 
 // Provider provides utilities for different jobs.
@@ -19,19 +27,18 @@ type Provider interface {
 		deployedJob *unstructured.Unstructured) (*commonv1.JobCondition, error)
 	// IsTrainingContainer returns if the c is the actual training container.
 	IsTrainingContainer(index int, c corev1.Container) bool
+	// Mutate jobSpec before creation if necessary
+	MutateJob(*v1alpha3.Trial, *unstructured.Unstructured) error
+	// Recreate Provider from kind
+	Create(kind string) Provider
 }
 
 // New creates a new Provider.
 func New(kind string) (Provider, error) {
-	switch kind {
-	case consts.JobKindJob:
-		return &job.Job{}, nil
-	case consts.JobKindPyTorch, consts.JobKindTF:
-		return &kubeflow.Kubeflow{
-			Kind: kind,
-		}, nil
-	default:
+	if ptr, ok := ProviderRegistry[kind]; ok {
+		return ptr.Create(kind), nil
+	} else {
 		return nil, fmt.Errorf(
-			"Failed to create the provider: Unknown kind %s", kind)
+			"failed to create the provider: Unknown kind %s", kind)
 	}
 }
diff --git a/pkg/webhook/v1alpha3/experiment/validator/validator.go b/pkg/webhook/v1alpha3/experiment/validator/validator.go
index d0cefb08b28..fdcff19dc26 100644
--- a/pkg/webhook/v1alpha3/experiment/validator/validator.go
+++ b/pkg/webhook/v1alpha3/experiment/validator/validator.go
@@ -145,7 +145,7 @@ func (g *DefaultValidator) validateTrialTemplate(instance *experimentsv1alpha3.E
 
 func (g *DefaultValidator) validateSupportedJob(job *unstructured.Unstructured) error {
 	gvk := job.GroupVersionKind()
-	supportedJobs := jobv1alpha3.GetSupportedJobList()
+	supportedJobs := jobv1alpha3.SupportedJobList
 	for _, sJob := range supportedJobs {
 		if gvk == sJob {
 			return nil
diff --git a/pkg/webhook/v1alpha3/pod/inject_webhook_test.go b/pkg/webhook/v1alpha3/pod/inject_webhook_test.go
index 51fcc9ee785..83195e5406a 100644
--- a/pkg/webhook/v1alpha3/pod/inject_webhook_test.go
+++ b/pkg/webhook/v1alpha3/pod/inject_webhook_test.go
@@ -4,7 +4,7 @@ import (
 	"testing"
 
 	common "github.com/kubeflow/katib/pkg/apis/controller/common/v1alpha3"
-	v1 "k8s.io/api/core/v1"
+	"k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/equality"
 )
 
diff --git a/pkg/webhook/v1alpha3/pod/utils.go b/pkg/webhook/v1alpha3/pod/utils.go
index d9dd8f3b5cb..af852f87b62 100644
--- a/pkg/webhook/v1alpha3/pod/utils.go
+++ b/pkg/webhook/v1alpha3/pod/utils.go
@@ -33,7 +33,7 @@ import (
 )
 
 func getKatibJob(pod *v1.Pod) (string, string, error) {
-	for _, gvk := range jobv1alpha3.GetSupportedJobList() {
+	for _, gvk := range jobv1alpha3.SupportedJobList {
 		owners := pod.GetOwnerReferences()
 		for _, owner := range owners {
 			if isMatchGVK(owner, gvk) {