diff --git a/frontend/src/components/workspace/input-box.tsx b/frontend/src/components/workspace/input-box.tsx
index c64b3deb..ac3c73c9 100644
--- a/frontend/src/components/workspace/input-box.tsx
+++ b/frontend/src/components/workspace/input-box.tsx
@@ -70,6 +70,7 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
+import { Input } from "@/components/ui/input";
 import { Tag } from "@/components/ui/tag";
 import { useReferenceFiles } from "@/core/artifacts/references";
 import { urlOfArtifact } from "@/core/artifacts/utils";
@@ -286,6 +287,7 @@ export function InputBox({
   const [memoryPanelOpen, setMemoryPanelOpen] = useState(false);
   const [references, setReferences] = useState<PromptInputReference[]>([]);
   const [mentionQuery, setMentionQuery] = useState("");
+  const [mentionSearchText, setMentionSearchText] = useState("");
   const [mentionOpen, setMentionOpen] = useState(false);
   const [activeMentionIndex, setActiveMentionIndex] = useState(0);
   const [mentionRange, setMentionRange] = useState<{
@@ -294,7 +296,15 @@ export function InputBox({
   } | null>(null);
   const [isInputToolsTourOpen, setIsInputToolsTourOpen] = useState(false);
   const [isInputToolsTourReady, setIsInputToolsTourReady] = useState(false);
-  const { data: referenceFilesData } = useReferenceFiles(threadIdFromProps);
+  const { data: referenceFilesData, refetch: refetchReferenceFiles } =
+    useReferenceFiles(threadIdFromProps);
+
+  // 打开附件引用弹窗时刷新数据
+  useEffect(() => {
+    if (mentionOpen) {
+      refetchReferenceFiles();
+    }
+  }, [mentionOpen, refetchReferenceFiles]);
 
   // Welcome 态下禁用收缩，始终保持展开
   const effectiveIsFocused =
@@ -478,15 +488,24 @@ export function InputBox({
 
   const filteredMentionCandidates = useMemo(() => {
     const query = mentionQuery.trim().toLowerCase();
-    if (!query) {
-      return mentionCandidates;
+    const search = mentionSearchText.trim().toLowerCase();
+    let result = mentionCandidates;
+    if (query) {
+      result = result.filter((candidate) =>
+        `${candidate.filename} ${candidate.typeLabel} ${candidate.pathTail}`
+          .toLowerCase()
+          .includes(query),
+      );
     }
-    return mentionCandidates.filter((candidate) =>
-      `${candidate.filename} ${candidate.typeLabel} ${candidate.pathTail}`
-        .toLowerCase()
-        .includes(query),
-    );
-  }, [mentionCandidates, mentionQuery]);
+    if (search) {
+      result = result.filter((candidate) =>
+        `${candidate.filename} ${candidate.typeLabel} ${candidate.pathTail}`
+          .toLowerCase()
+          .includes(search),
+      );
+    }
+    return result;
+  }, [mentionCandidates, mentionQuery, mentionSearchText]);
   const handleModelSelect = useCallback(
     (model_name: string) => {
       onContextChange?.({
@@ -594,6 +613,7 @@ export function InputBox({
         });
       }
       setMentionQuery("");
+      setMentionSearchText("");
       setMentionOpen(false);
       setActiveMentionIndex(0);
       setMentionRange(null);
@@ -634,6 +654,7 @@ export function InputBox({
       if (!token) {
         setMentionOpen(false);
         setMentionQuery("");
+        setMentionSearchText("");
         setActiveMentionIndex(0);
         setMentionRange(null);
         return;
@@ -683,6 +704,7 @@ export function InputBox({
         }
       } else if (event.key === "Escape") {
         event.preventDefault();
+        setMentionSearchText("");
         setMentionOpen(false);
         setMentionRange(null);
       }
@@ -861,6 +883,7 @@ export function InputBox({
             onOpenChange={(open) => {
               setMentionOpen(open);
               if (!open) {
+                setMentionSearchText("");
                 setMentionRange(null);
               }
             }}
@@ -888,7 +911,30 @@ export function InputBox({
               <DropdownMenuLabel className="p-0 text-sm text-ws-fg-primary">
                 {t.inputBox.addReference}
               </DropdownMenuLabel>
-              <DropdownMenuSeparator className="mx-0 mt-[20px] mb-0" />
+              <Input
+                className="mt-3 h-8 text-sm"
+                placeholder="搜索文件..."
+                value={mentionSearchText}
+                autoFocus
+                onChange={(e) => {
+                  setMentionSearchText(e.target.value);
+                  setActiveMentionIndex(0);
+                }}
+                onKeyDown={(e) => {
+                  if (e.key === "ArrowDown" || e.key === "ArrowUp") {
+                    e.preventDefault();
+                    // 将焦点交还给 dropdown，让现有的键盘导航逻辑处理
+                    const items =
+                      document.querySelectorAll<HTMLElement>(
+                        '[data-testid="mention-candidate-item"]',
+                      );
+                    if (items.length > 0) {
+                      (items[0] as HTMLElement).focus();
+                    }
+                  }
+                }}
+              />
+              <DropdownMenuSeparator className="mx-0 mt-3 mb-0" />
               <DropdownMenuGroup className="flex min-h-0 flex-col gap-[10px] px-0">
                 <ScrollArea className="h-[320px] pt-[20px]" hideScrollbar={false}>
                   {filteredMentionCandidates.map((candidate, index) => {