diff --git a/pkg/streaming/walimpls/impls/pulsar/backlog_clear_helper.go b/pkg/streaming/walimpls/impls/pulsar/backlog_clear_helper.go
index 4024d19482..298042bf0d 100644
--- a/pkg/streaming/walimpls/impls/pulsar/backlog_clear_helper.go
+++ b/pkg/streaming/walimpls/impls/pulsar/backlog_clear_helper.go
@@ -29,10 +29,11 @@ type backlogClearHelper struct {
 	channelName    types.PChannelInfo
 	c              pulsar.Client
 	reusedConsumer pulsar.Consumer
+	tenant         tenant
 }
 
 // newBacklogClearHelper creates a new backlog clear helper.
-func newBacklogClearHelper(c pulsar.Client, channelName types.PChannelInfo, threshold int64) *backlogClearHelper {
+func newBacklogClearHelper(c pulsar.Client, channelName types.PChannelInfo, threshold int64, tenant tenant) *backlogClearHelper {
 	h := &backlogClearHelper{
 		notifier:       syncutil.NewAsyncTaskNotifier[struct{}](),
 		cond:           syncutil.NewContextCond(&sync.Mutex{}),
@@ -41,6 +42,7 @@ func newBacklogClearHelper(c pulsar.Client, channelName types.PChannelInfo, thre
 		channelName:    channelName,
 		c:              c,
 		reusedConsumer: nil,
+		tenant:         tenant,
 	}
 	h.SetLogger(log.With(zap.String("channel", channelName.String()), log.FieldComponent("backlog-clear")))
 	go h.background()
@@ -110,8 +112,9 @@ func (h *backlogClearHelper) getConsumer() (pulsar.Consumer, error) {
 	if h.reusedConsumer != nil {
 		return h.reusedConsumer, nil
 	}
+	topic := h.tenant.MustGetFullTopicName(h.channelName.Name)
 	consumer, err := h.c.Subscribe(pulsar.ConsumerOptions{
-		Topic:                    h.channelName.Name,
+		Topic:                    topic,
 		SubscriptionName:         backlogClearHelperName,
 		Type:                     pulsar.Shared, // use shared subscription to avoid the subscription is rejected because of consumer exists.
 		MaxPendingChunkedMessage: 1,             // We cannot set it to 0, because the 0 means 100.
diff --git a/pkg/streaming/walimpls/impls/pulsar/builder.go b/pkg/streaming/walimpls/impls/pulsar/builder.go
index 1b3d9e6646..1d7091939b 100644
--- a/pkg/streaming/walimpls/impls/pulsar/builder.go
+++ b/pkg/streaming/walimpls/impls/pulsar/builder.go
@@ -31,7 +31,7 @@ func (b *builderImpl) Name() message.WALName {
 
 // Build build a wal instance.
 func (b *builderImpl) Build() (walimpls.OpenerImpls, error) {
-	options, err := b.getPulsarClientOptions()
+	options, tenant, err := b.getPulsarClientOptions()
 	if err != nil {
 		return nil, errors.Wrapf(err, "build pulsar client options failed")
 	}
@@ -40,16 +40,17 @@ func (b *builderImpl) Build() (walimpls.OpenerImpls, error) {
 		return nil, err
 	}
 	return &openerImpl{
-		c: c,
+		tenant: tenant,
+		c:      c,
 	}, nil
 }
 
 // getPulsarClientOptions gets the pulsar client options from the config.
-func (b *builderImpl) getPulsarClientOptions() (pulsar.ClientOptions, error) {
+func (b *builderImpl) getPulsarClientOptions() (pulsar.ClientOptions, tenant, error) {
 	cfg := &paramtable.Get().PulsarCfg
 	auth, err := pulsar.NewAuthentication(cfg.AuthPlugin.GetValue(), cfg.AuthParams.GetValue())
 	if err != nil {
-		return pulsar.ClientOptions{}, errors.New("build authencation from config failed")
+		return pulsar.ClientOptions{}, tenant{}, errors.New("build authencation from config failed")
 	}
 	options := pulsar.ClientOptions{
 		URL:              cfg.Address.GetValue(),
@@ -61,5 +62,8 @@ func (b *builderImpl) getPulsarClientOptions() (pulsar.ClientOptions, error) {
 		// Enable client metrics if config.EnableClientMetrics is true, use pkg-defined registerer.
 		options.MetricsRegisterer = metrics.GetRegisterer()
 	}
-	return options, nil
+	return options, tenant{
+		namespace: cfg.Namespace.GetValue(),
+		tenant:    cfg.Tenant.GetValue(),
+	}, nil
 }
diff --git a/pkg/streaming/walimpls/impls/pulsar/opener.go b/pkg/streaming/walimpls/impls/pulsar/opener.go
index 2e75204cd4..ef4ba3df92 100644
--- a/pkg/streaming/walimpls/impls/pulsar/opener.go
+++ b/pkg/streaming/walimpls/impls/pulsar/opener.go
@@ -2,6 +2,7 @@ package pulsar
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/apache/pulsar-client-go/pulsar"
 
@@ -19,9 +20,25 @@ const (
 
 var _ walimpls.OpenerImpls = (*openerImpl)(nil)
 
+// tenant is the tenant of pulsar.
+type tenant struct {
+	tenant    string
+	namespace string
+}
+
+// MustGetFullTopicName gets the full topic name of pulsar.
+// If the tenant or namespace or topic is empty, it will panic.
+func (t tenant) MustGetFullTopicName(topic string) string {
+	if len(t.tenant) == 0 || len(t.namespace) == 0 || len(topic) == 0 {
+		panic("tenant or namespace or topic is empty")
+	}
+	return fmt.Sprintf("%s/%s/%s", t.tenant, t.namespace, topic)
+}
+
 // openerImpl is the opener for pulsar wal.
 type openerImpl struct {
-	c pulsar.Client
+	tenant tenant
+	c      pulsar.Client
 }
 
 // Open opens a wal instance.
@@ -36,7 +53,7 @@ func (o *openerImpl) Open(ctx context.Context, opt *walimpls.OpenOption) (walimp
 		if backlogAutoClearBytes <= 0 {
 			backlogAutoClearBytes = defaultBacklogSize
 		}
-		backlogClearHelper = newBacklogClearHelper(o.c, opt.Channel, backlogAutoClearBytes)
+		backlogClearHelper = newBacklogClearHelper(o.c, opt.Channel, backlogAutoClearBytes, o.tenant)
 	}
 	w := &walImpl{
 		WALHelper:          helper.NewWALHelper(opt),
@@ -44,6 +61,7 @@ func (o *openerImpl) Open(ctx context.Context, opt *walimpls.OpenOption) (walimp
 		p:                  syncutil.NewFuture[pulsar.Producer](),
 		notifier:           syncutil.NewAsyncTaskNotifier[struct{}](),
 		backlogClearHelper: backlogClearHelper,
+		tenant:             o.tenant,
 	}
 	// because the producer of pulsar cannot be created if the topic is backlog exceeded,
 	// so we need to set the producer at background with backoff retry.
diff --git a/pkg/streaming/walimpls/impls/pulsar/pulsar_test.go b/pkg/streaming/walimpls/impls/pulsar/pulsar_test.go
index f06d30d37e..6982657640 100644
--- a/pkg/streaming/walimpls/impls/pulsar/pulsar_test.go
+++ b/pkg/streaming/walimpls/impls/pulsar/pulsar_test.go
@@ -17,6 +17,14 @@ func TestMain(m *testing.M) {
 	m.Run()
 }
 
+func TestTenant(t *testing.T) {
+	tenant := tenant{
+		tenant:    "milvus",
+		namespace: "aaa",
+	}
+	assert.Equal(t, "milvus/aaa/test", tenant.MustGetFullTopicName("test"))
+}
+
 func TestRegistry(t *testing.T) {
 	registeredB := registry.MustGetBuilder(message.WALNamePulsar)
 	assert.NotNil(t, registeredB)
diff --git a/pkg/streaming/walimpls/impls/pulsar/wal.go b/pkg/streaming/walimpls/impls/pulsar/wal.go
index 769cebf29b..1e9a077c54 100644
--- a/pkg/streaming/walimpls/impls/pulsar/wal.go
+++ b/pkg/streaming/walimpls/impls/pulsar/wal.go
@@ -25,6 +25,7 @@ type walImpl struct {
 	p                  *syncutil.Future[pulsar.Producer]
 	notifier           *syncutil.AsyncTaskNotifier[struct{}]
 	backlogClearHelper *backlogClearHelper
+	tenant             tenant
 }
 
 // initProducerAtBackground initializes the producer at background.
@@ -56,8 +57,9 @@ func (w *walImpl) initProducerAtBackground() {
 
 // initProducer initializes the producer.
 func (w *walImpl) initProducer() error {
+	topic := w.tenant.MustGetFullTopicName(w.Channel().Name)
 	p, err := w.c.CreateProducer(pulsar.ProducerOptions{
-		Topic: w.Channel().Name,
+		Topic: topic,
 		// TODO: current go pulsar client does not support fencing, we should enable it after go pulsar client supports it.
 		// ProducerAccessMode: pulsar.ProducerAccessModeExclusiveWithFencing,
 	})
@@ -98,9 +100,10 @@ func (w *walImpl) Append(ctx context.Context, msg message.MutableMessage) (messa
 }
 
 func (w *walImpl) Read(ctx context.Context, opt walimpls.ReadOption) (s walimpls.ScannerImpls, err error) {
+	topic := w.tenant.MustGetFullTopicName(w.Channel().Name)
 	ch := make(chan pulsar.ReaderMessage, 1)
 	readerOpt := pulsar.ReaderOptions{
-		Topic:             w.Channel().Name,
+		Topic:             topic,
 		Name:              opt.Name,
 		MessageChannel:    ch,
 		ReceiverQueueSize: opt.ReadAheadBufferSize,
@@ -141,8 +144,9 @@ func (w *walImpl) Truncate(ctx context.Context, id message.MessageID) error {
 		// The backlogClearHelper is always non-nil currently, so we can determine the truncate position
 		return nil
 	}
+	topic := w.tenant.MustGetFullTopicName(w.Channel().Name)
 	cursor, err := w.c.Subscribe(pulsar.ConsumerOptions{
-		Topic:                    w.Channel().Name,
+		Topic:                    topic,
 		SubscriptionName:         truncateCursorSubscriptionName,
 		Type:                     pulsar.Exclusive,
 		MaxPendingChunkedMessage: 1, // We cannot set it to 0, because the 0 means 100.