diff --git a/client/client.go b/client/client.go
index 1ae9dcda..1811781c 100644
--- a/client/client.go
+++ b/client/client.go
@@ -52,7 +52,7 @@ type Client interface {
 	// NewCollection intializeds a new collection with pre defined attributes
 	NewCollection(ctx context.Context, collName string, dimension int64, opts ...CreateCollectionOption) error
 	// ListCollections list collections from connection
-	ListCollections(ctx context.Context) ([]*entity.Collection, error)
+	ListCollections(ctx context.Context, opts ...ListCollectionOption) ([]*entity.Collection, error)
 	// CreateCollection create collection using provided schema
 	CreateCollection(ctx context.Context, schema *entity.Schema, shardsNum int32, opts ...CreateCollectionOption) error
 	// DescribeCollection describe collection meta
diff --git a/client/collection.go b/client/collection.go
index 98b0cb4b..bf5fdec7 100644
--- a/client/collection.go
+++ b/client/collection.go
@@ -45,14 +45,25 @@ func handleRespStatus(status *commonpb.Status) error {
 
 // ListCollections list collections from connection
 // Note that schema info are not provided in collection list
-func (c *GrpcClient) ListCollections(ctx context.Context) ([]*entity.Collection, error) {
+func (c *GrpcClient) ListCollections(ctx context.Context, opts ...ListCollectionOption) ([]*entity.Collection, error) {
 	if c.Service == nil {
 		return []*entity.Collection{}, ErrClientNotReady
 	}
+
+	o := &listCollectionOpt{}
+	for _, opt := range opts {
+		opt(o)
+	}
+
 	req := &milvuspb.ShowCollectionsRequest{
 		DbName:    "",
 		TimeStamp: 0, // means now
 	}
+
+	if o.showInMemory {
+		req.Type = milvuspb.ShowType_InMemory
+	}
+
 	resp, err := c.Service.ShowCollections(ctx, req)
 	if err != nil {
 		return []*entity.Collection{}, err
diff --git a/client/options.go b/client/options.go
index dc82454c..6ac2a962 100644
--- a/client/options.go
+++ b/client/options.go
@@ -289,6 +289,18 @@ func GetWithOutputFields(outputFields ...string) GetOption {
 	}
 }
 
+type listCollectionOpt struct {
+	showInMemory bool
+}
+
+type ListCollectionOption func(*listCollectionOpt)
+
+func WithShowInMemory(value bool) ListCollectionOption {
+	return func(opt *listCollectionOpt) {
+		opt.showInMemory = value
+	}
+}
+
 type DropCollectionOption func(*milvuspb.DropCollectionRequest)
 
 type ReleaseCollectionOption func(*milvuspb.ReleaseCollectionRequest)