diff --git a/amoro-ams/src/main/java/org/apache/amoro/server/dashboard/ServerTableDescriptor.java b/amoro-ams/src/main/java/org/apache/amoro/server/dashboard/ServerTableDescriptor.java
index 4ffd7eee1a..2eb7da70e6 100644
--- a/amoro-ams/src/main/java/org/apache/amoro/server/dashboard/ServerTableDescriptor.java
+++ b/amoro-ams/src/main/java/org/apache/amoro/server/dashboard/ServerTableDescriptor.java
@@ -39,8 +39,6 @@
 import org.apache.commons.lang3.tuple.Pair;
 import org.apache.iceberg.util.ThreadPools;
 
-import javax.annotation.Nullable;
-
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -82,7 +80,7 @@ public List<AmoroSnapshotsOfTable> getSnapshots(
   }
 
   public List<PartitionFileBaseInfo> getSnapshotDetail(
-      TableIdentifier tableIdentifier, String snapshotId, @Nullable String ref) {
+      TableIdentifier tableIdentifier, String snapshotId, String ref) {
     AmoroTable<?> amoroTable = loadTable(tableIdentifier);
     FormatTableDescriptor formatTableDescriptor = formatDescriptorMap.get(amoroTable.format());
     return formatTableDescriptor.getSnapshotDetail(amoroTable, snapshotId, ref);
diff --git a/amoro-common/src/main/java/org/apache/amoro/table/descriptor/FormatTableDescriptor.java b/amoro-common/src/main/java/org/apache/amoro/table/descriptor/FormatTableDescriptor.java
index 89473bc894..03bbea7938 100644
--- a/amoro-common/src/main/java/org/apache/amoro/table/descriptor/FormatTableDescriptor.java
+++ b/amoro-common/src/main/java/org/apache/amoro/table/descriptor/FormatTableDescriptor.java
@@ -22,8 +22,6 @@
 import org.apache.amoro.TableFormat;
 import org.apache.commons.lang3.tuple.Pair;
 
-import javax.annotation.Nullable;
-
 import java.util.List;
 import java.util.concurrent.ExecutorService;
 
@@ -49,7 +47,7 @@ List<AmoroSnapshotsOfTable> getSnapshots(
 
   /** Get the snapshot detail information of the {@link AmoroTable}. */
   List<PartitionFileBaseInfo> getSnapshotDetail(
-      AmoroTable<?> amoroTable, String snapshotId, @Nullable String ref);
+      AmoroTable<?> amoroTable, String snapshotId, String ref);
 
   /** Get the DDL information of the {@link AmoroTable}. */
   List<DDLInfo> getTableOperations(AmoroTable<?> amoroTable);
diff --git a/amoro-format-paimon/src/main/java/org/apache/amoro/formats/paimon/PaimonTableDescriptor.java b/amoro-format-paimon/src/main/java/org/apache/amoro/formats/paimon/PaimonTableDescriptor.java
index a79b1a0073..d94ddc937d 100644
--- a/amoro-format-paimon/src/main/java/org/apache/amoro/formats/paimon/PaimonTableDescriptor.java
+++ b/amoro-format-paimon/src/main/java/org/apache/amoro/formats/paimon/PaimonTableDescriptor.java
@@ -63,8 +63,6 @@
 import org.apache.paimon.utils.SnapshotManager;
 import org.jetbrains.annotations.NotNull;
 
-import javax.annotation.Nullable;
-
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -225,16 +223,17 @@ public List<AmoroSnapshotsOfTable> getSnapshots(
 
   @Override
   public List<PartitionFileBaseInfo> getSnapshotDetail(
-      AmoroTable<?> amoroTable, String snapshotId, @Nullable String ref) {
+      AmoroTable<?> amoroTable, String snapshotId, String ref) {
     FileStoreTable table = getTable(amoroTable);
     List<PartitionFileBaseInfo> amsDataFileInfos = new ArrayList<>();
     long commitId = Long.parseLong(snapshotId);
     Snapshot snapshot;
-    if (ref != null) {
+    if (BranchManager.isMainBranch(ref) || table.branchManager().branchExists(ref)) {
       snapshot = table.snapshotManager().copyWithBranch(ref).snapshot(commitId);
     } else {
-      snapshot = table.snapshotManager().snapshot(commitId);
+      snapshot = table.tagManager().tag(ref);
     }
+
     FileStore<?> store = table.store();
     FileStorePathFactory fileStorePathFactory = store.pathFactory();
     ManifestList manifestList = store.manifestListFactory().create();
@@ -528,10 +527,8 @@ public List<TagOrBranchInfo> getTableTags(AmoroTable<?> amoroTable) {
   public List<TagOrBranchInfo> getTableBranches(AmoroTable<?> amoroTable) {
     FileStoreTable table = getTable(amoroTable);
     List<String> branches = table.branchManager().branches();
-
     List<TagOrBranchInfo> branchInfos =
         branches.stream()
-            .filter(name -> !BranchManager.isMainBranch(name))
             .map(name -> new TagOrBranchInfo(name, -1, -1, 0L, 0L, TagOrBranchInfo.BRANCH))
             .collect(Collectors.toList());
     branchInfos.add(TagOrBranchInfo.MAIN_BRANCH);