diff --git a/ctrd/client.go b/ctrd/client.go
index 19e54ac05..4fc227e24 100644
--- a/ctrd/client.go
+++ b/ctrd/client.go
@@ -4,7 +4,6 @@ import (
 	"context"
 
 	"github.com/containerd/containerd"
-	"github.com/containerd/containerd/version"
 
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -33,7 +32,7 @@ type Client struct {
 }
 
 // NewClient connect to containerd.
-func NewClient(cfg Config) (*Client, error) {
+func NewClient(cfg Config) (APIClient, error) {
 	if cfg.Address == "" {
 		cfg.Address = unixSocketPath
 	}
@@ -97,6 +96,6 @@ func (c *Client) Close() error {
 }
 
 // Version returns the version of containerd.
-func (c *Client) Version() (string, error) {
-	return version.Version, nil
+func (c *Client) Version(ctx context.Context) (containerd.Version, error) {
+	return c.client.Version(ctx)
 }
diff --git a/ctrd/interface.go b/ctrd/interface.go
new file mode 100644
index 000000000..0e296527d
--- /dev/null
+++ b/ctrd/interface.go
@@ -0,0 +1,76 @@
+package ctrd
+
+import (
+	"context"
+	"time"
+
+	"github.com/alibaba/pouch/apis/types"
+	"github.com/alibaba/pouch/daemon/containerio"
+	"github.com/alibaba/pouch/pkg/jsonstream"
+
+	"github.com/containerd/containerd"
+	"github.com/containerd/containerd/snapshots"
+	"github.com/opencontainers/image-spec/specs-go/v1"
+)
+
+// APIClient defines common methods of containerd api client
+type APIClient interface {
+	ContainerAPIClient
+	ImageAPIClient
+	SnapshotAPIClient
+
+	Version(ctx context.Context) (containerd.Version, error)
+}
+
+// ContainerAPIClient provides access to containerd container features.
+type ContainerAPIClient interface {
+	// CreateContainer creates a containerd container and start process.
+	CreateContainer(ctx context.Context, container *Container) error
+	// DestroyContainer kill container and delete it.
+	DestroyContainer(ctx context.Context, id string, timeout int64) (*Message, error)
+	// ProbeContainer probe the container's status, if timeout <= 0, will block to receive message.
+	ProbeContainer(ctx context.Context, id string, timeout time.Duration) *Message
+	// ContainerPIDs returns the all processes's ids inside the container.
+	ContainerPIDs(ctx context.Context, id string) ([]int, error)
+	// ContainerPID returns the container's init process id.
+	ContainerPID(ctx context.Context, id string) (int, error)
+	// ExecContainer executes a process in container.
+	ExecContainer(ctx context.Context, process *Process) error
+	// RecoverContainer reload the container from metadata and watch it, if program be restarted.
+	RecoverContainer(ctx context.Context, id string, io *containerio.IO) error
+	// PauseContainer pause container.
+	PauseContainer(ctx context.Context, id string) error
+	// UnpauseContainer unpauses a container.
+	UnpauseContainer(ctx context.Context, id string) error
+	// ResizeContainer changes the size of the TTY of the init process running
+	// in the container to the given height and width.
+	ResizeContainer(ctx context.Context, id string, opts types.ResizeOptions) error
+	// UpdateResources updates the configurations of a container.
+	UpdateResources(ctx context.Context, id string, resources types.Resources) error
+	// SetExitHooks specified the handlers of container exit.
+	SetExitHooks(hooks ...func(string, *Message) error)
+	// SetExecExitHooks specified the handlers of exec process exit.
+	SetExecExitHooks(hooks ...func(string, *Message) error)
+}
+
+// ImageAPIClient provides access to containerd image features.
+type ImageAPIClient interface {
+	// GetOciImage returns the OCI Image.
+	GetOciImage(ctx context.Context, ref string) (v1.Image, error)
+	// RemoveImage deletes an image.
+	RemoveImage(ctx context.Context, ref string) error
+	// ListImages lists all images.
+	ListImages(ctx context.Context, filter ...string) ([]types.ImageInfo, error)
+	// PullImage downloads an image from the remote repository.
+	PullImage(ctx context.Context, ref string, authConfig *types.AuthConfig, stream *jsonstream.JSONStream) (types.ImageInfo, error)
+}
+
+// SnapshotAPIClient provides access to containerd snapshot features
+type SnapshotAPIClient interface {
+	// CreateSnapshot creates a active snapshot with image's name and id.
+	CreateSnapshot(ctx context.Context, id, ref string) error
+	// GetSnapshot returns the snapshot's info by id.
+	GetSnapshot(ctx context.Context, id string) (snapshots.Info, error)
+	// RemoveSnapshot removes the snapshot by id.
+	RemoveSnapshot(ctx context.Context, id string) error
+}
diff --git a/daemon/daemon.go b/daemon/daemon.go
index 91d6f3130..751c6d1d4 100644
--- a/daemon/daemon.go
+++ b/daemon/daemon.go
@@ -26,7 +26,7 @@ import (
 type Daemon struct {
 	config          config.Config
 	containerStore  *meta.Store
-	containerd      *ctrd.Client
+	containerd      ctrd.APIClient
 	containerMgr    mgr.ContainerMgr
 	systemMgr       mgr.SystemMgr
 	imageMgr        mgr.ImageMgr
@@ -255,7 +255,7 @@ func (d *Daemon) NetMgr() mgr.NetworkMgr {
 }
 
 // Containerd gets containerd client.
-func (d *Daemon) Containerd() *ctrd.Client {
+func (d *Daemon) Containerd() ctrd.APIClient {
 	return d.containerd
 }
 
diff --git a/daemon/mgr/container.go b/daemon/mgr/container.go
index b3d89b49e..c69644c79 100644
--- a/daemon/mgr/container.go
+++ b/daemon/mgr/container.go
@@ -98,7 +98,7 @@ type ContainerManager struct {
 	Store *meta.Store
 
 	// Client is used to interact with containerd.
-	Client *ctrd.Client
+	Client ctrd.APIClient
 
 	// NameToID stores relations between container's name and ID.
 	// It is used to get container ID via container name.
@@ -123,7 +123,7 @@ type ContainerManager struct {
 }
 
 // NewContainerManager creates a brand new container manager.
-func NewContainerManager(ctx context.Context, store *meta.Store, cli *ctrd.Client, imgMgr ImageMgr, volMgr VolumeMgr, netMgr NetworkMgr, cfg *config.Config, contPlugin plugins.ContainerPlugin) (*ContainerManager, error) {
+func NewContainerManager(ctx context.Context, store *meta.Store, cli ctrd.APIClient, imgMgr ImageMgr, volMgr VolumeMgr, netMgr NetworkMgr, cfg *config.Config, contPlugin plugins.ContainerPlugin) (*ContainerManager, error) {
 	mgr := &ContainerManager{
 		Store:           store,
 		NameToID:        collect.NewSafeMap(),
diff --git a/daemon/mgr/image.go b/daemon/mgr/image.go
index 263aa0c0b..ebe4eb121 100644
--- a/daemon/mgr/image.go
+++ b/daemon/mgr/image.go
@@ -49,16 +49,16 @@ type ImageManager struct {
 	// DefaultNamespace is the default namespace used in DefaultRegistry.
 	DefaultNamespace string
 
-	// client is a pointer to the containerd client.
+	// client is a interface to the containerd client.
 	// It is used to interact with containerd.
-	client   *ctrd.Client
+	client   ctrd.APIClient
 	registry *registry.Client
 
 	cache *imageCache
 }
 
 // NewImageManager initializes a brand new image manager.
-func NewImageManager(cfg *config.Config, client *ctrd.Client) (*ImageManager, error) {
+func NewImageManager(cfg *config.Config, client ctrd.APIClient) (*ImageManager, error) {
 	mgr := &ImageManager{
 		DefaultRegistry:  cfg.DefaultRegistry,
 		DefaultNamespace: cfg.DefaultRegistryNS,
diff --git a/docs/features/pouch_with_rich_container.md b/docs/features/pouch_with_rich_container.md
index 77867c9f5..ffa4978f5 100644
--- a/docs/features/pouch_with_rich_container.md
+++ b/docs/features/pouch_with_rich_container.md
@@ -30,7 +30,7 @@ If a container is running with `--rich` flag, then every start or restart of thi
 
 Here is a simple example for rich container mode using dumb-init to init contaienr:
 
-1. Insatll dumb-init as following:
+1. Install dumb-init as following:
 
     ```shell
     # wget -O /usr/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.1/dumb-init_1.2.1_amd64
diff --git a/internal/generator.go b/internal/generator.go
index 1798aa105..4aeb7abb6 100644
--- a/internal/generator.go
+++ b/internal/generator.go
@@ -14,7 +14,7 @@ import (
 // DaemonProvider provides resources which are needed by container manager and are from daemon.
 type DaemonProvider interface {
 	Config() *config.Config
-	Containerd() *ctrd.Client
+	Containerd() ctrd.APIClient
 	CtrMgr() mgr.ContainerMgr
 	ImgMgr() mgr.ImageMgr
 	VolMgr() mgr.VolumeMgr