diff --git a/internal/rootcoord/dml_channels.go b/internal/rootcoord/dml_channels.go
index e744ad42f9..10e51f1936 100644
--- a/internal/rootcoord/dml_channels.go
+++ b/internal/rootcoord/dml_channels.go
@@ -158,7 +158,7 @@ func newDmlChannels(ctx context.Context, factory msgstream.Factory, chanNamePref
 	// if topic created, use the existed topic
 	if params.PreCreatedTopicEnabled.GetAsBool() {
 		chanNamePrefix = ""
-		chanNum = int64(len(params.TopicNames.GetAsStrings())) + chanNumDefault
+		chanNum = int64(len(params.TopicNames.GetAsStrings()))
 		names = params.TopicNames.GetAsStrings()
 	} else {
 		chanNamePrefix = chanNamePrefixDefault
@@ -361,31 +361,62 @@ func genChannelNames(prefix string, num int64) []string {
 	return results
 }
 
-func parseChannelNameIndex(channeName string) int {
-	index := strings.LastIndex(channeName, "_")
+func parseChannelNameIndex(channelName string) int {
+	index := strings.LastIndex(channelName, "_")
 	if index < 0 {
-		log.Error("invalid channel name", zap.String("chanName", channeName))
-		panic("invalid channel name: " + channeName)
+		log.Error("invalid channel name", zap.String("chanName", channelName))
+		panic("invalid channel name: " + channelName)
 	}
-	index, err := strconv.Atoi(channeName[index+1:])
+	index, err := strconv.Atoi(channelName[index+1:])
 	if err != nil {
-		log.Error("invalid channel name", zap.String("chanName", channeName), zap.Error(err))
-		panic("invalid channel name: " + channeName)
+		log.Error("invalid channel name", zap.String("chanName", channelName), zap.Error(err))
+		panic("invalid channel name: " + channelName)
 	}
 	return index
 }
 
 func getNeedChanNum(setNum int, chanMap map[typeutil.UniqueID][]string) int {
 	// find the largest number of current channel usage
-	maxChanUsed := setNum
-	for _, chanNames := range chanMap {
-		for _, chanName := range chanNames {
-			index := parseChannelNameIndex(chanName)
-			if maxChanUsed < index+1 {
-				maxChanUsed = index + 1
+	maxChanUsed := 0
+	isPreCreatedTopicEnabled := paramtable.Get().CommonCfg.PreCreatedTopicEnabled.GetAsBool()
+	chanNameSet := typeutil.NewSet[string]()
+
+	if isPreCreatedTopicEnabled {
+		// can only use the topic in the list when preCreatedTopicEnabled
+		topics := paramtable.Get().CommonCfg.TopicNames.GetAsStrings()
+
+		if len(topics) == 0 {
+			panic("no topic were specified when pre-created")
+		}
+		for _, topic := range topics {
+			if len(topic) == 0 {
+				panic("topic were empty")
+			}
+			if chanNameSet.Contain(topic) {
+				log.Error("duplicate topics are pre-created", zap.String("topic", topic))
+				panic("duplicate topic: " + topic)
+			}
+			chanNameSet.Insert(topic)
+		}
+
+		for _, chanNames := range chanMap {
+			for _, chanName := range chanNames {
+				if !chanNameSet.Contain(chanName) {
+					log.Error("invalid channel that is not in the list when pre-created topic", zap.String("chanName", chanName))
+					panic("invalid chanName: " + chanName)
+				}
+			}
+		}
+	} else {
+		maxChanUsed = setNum
+		for _, chanNames := range chanMap {
+			for _, chanName := range chanNames {
+				index := parseChannelNameIndex(chanName)
+				if maxChanUsed < index+1 {
+					maxChanUsed = index + 1
+				}
 			}
 		}
 	}
-
 	return maxChanUsed
 }
diff --git a/internal/rootcoord/dml_channels_test.go b/internal/rootcoord/dml_channels_test.go
index b4b13c1b5d..51d382f122 100644
--- a/internal/rootcoord/dml_channels_test.go
+++ b/internal/rootcoord/dml_channels_test.go
@@ -196,6 +196,65 @@ func TestDmChannelsFailure(t *testing.T) {
 	wg.Wait()
 }
 
+func TestGetNeedChanNum(t *testing.T) {
+	paramtable.Get().Save(Params.CommonCfg.PreCreatedTopicEnabled.Key, "true")
+	defer paramtable.Get().Reset(Params.CommonCfg.PreCreatedTopicEnabled.Key)
+	chans := map[UniqueID][]string{}
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	t.Run("topic were empty", func(t *testing.T) {
+		defer wg.Done()
+		paramtable.Get().Save(Params.CommonCfg.TopicNames.Key, "")
+		defer paramtable.Get().Reset(Params.CommonCfg.TopicNames.Key)
+		assert.Panics(t, func() {
+			getNeedChanNum(10, chans)
+		})
+	})
+
+	wg.Add(1)
+	t.Run("duplicated topics", func(t *testing.T) {
+		defer wg.Done()
+		paramtable.Get().Save(Params.CommonCfg.TopicNames.Key, "topic1,topic1")
+		defer paramtable.Get().Reset(Params.CommonCfg.TopicNames.Key)
+		assert.Panics(t, func() {
+			getNeedChanNum(10, chans)
+		})
+	})
+
+	wg.Add(1)
+	t.Run("invalid channel channel that not in the list", func(t *testing.T) {
+		defer wg.Done()
+		paramtable.Get().Save(Params.CommonCfg.TopicNames.Key, "topic1,topic2")
+		defer paramtable.Get().Reset(Params.CommonCfg.TopicNames.Key)
+		chans[UniqueID(100)] = []string{"rootcoord-dml_0"}
+		assert.Panics(t, func() {
+			getNeedChanNum(10, chans)
+		})
+	})
+
+	wg.Add(1)
+	t.Run("normal case when pre-created topic", func(t *testing.T) {
+		defer wg.Done()
+		paramtable.Get().Save(Params.CommonCfg.TopicNames.Key, "topic1,topic2")
+		defer paramtable.Get().Reset(Params.CommonCfg.TopicNames.Key)
+		chans[UniqueID(100)] = []string{"topic1"}
+		assert.Equal(t, getNeedChanNum(10, chans), 0)
+	})
+
+	wg.Add(1)
+	t.Run("normal case", func(t *testing.T) {
+		defer wg.Done()
+		paramtable.Get().Save(Params.CommonCfg.PreCreatedTopicEnabled.Key, "false")
+		paramtable.Get().Save(Params.CommonCfg.RootCoordDml.Key, "rootcoord-dml")
+		defer paramtable.Get().Reset(Params.CommonCfg.RootCoordDml.Key)
+		chans[UniqueID(100)] = []string{"rootcoord-dml_99"}
+		assert.Equal(t, getNeedChanNum(10, chans), 100)
+	})
+
+	wg.Wait()
+}
+
 // FailMessageStreamFactory mock MessageStreamFactory failure
 type FailMessageStreamFactory struct {
 	msgstream.Factory