diff --git a/web/src/core-bridge/worker/channelDataKeys.ts b/web/src/core-bridge/worker/channelDataKeys.ts
index d6ff609..6bebab9 100644
--- a/web/src/core-bridge/worker/channelDataKeys.ts
+++ b/web/src/core-bridge/worker/channelDataKeys.ts
@@ -14,6 +14,10 @@ const states = new Map<string, CryptoState>();
 const domainId = (channelId: string, domain: string, epoch: number) => `${channelId}:${domain}:${epoch}`;
 const contextId = (spaceId: string, channelId: string, domain: string, epoch: number) => `${spaceId}:${channelId}:${domain}:${epoch}`;
 const loaded = new Map<string, DataKeys>();
+/** 服务端登记的对象作者(账号)。收到别人的消息时据此先显示名字,不必等结构刷新 */
+export function objectAuthorAccount(resourceId: string, itemId: string): string | undefined {
+  return states.get(resourceId)?.objects.find(o => o.itemId === itemId)?.authorAccount ?? undefined;
+}
 export function clearDataKeys(): void { objectKeys.clear(); states.clear(); loaded.clear(); }
 export function attachDataKeys(session: ChannelSession, resource: SavedResource): void {
   if (resource.kind !== 'channel') return;
diff --git a/web/src/core-bridge/worker/channelEvents.ts b/web/src/core-bridge/worker/channelEvents.ts
index 3062aa2..4afbe76 100644
--- a/web/src/core-bridge/worker/channelEvents.ts
+++ b/web/src/core-bridge/worker/channelEvents.ts
@@ -1,9 +1,10 @@
 import { parseLogRecords, parseEnvelope, toBase64Url, type ChannelSession, type LogRecord, type ReceivedItem } from '@webdrop/core';
-import { canDecryptRecord, objectEventProjection, readDataKeys, verifyObjectDeletion, verifyObjectEvent } from './channelDataKeys';
+import { canDecryptRecord, objectAuthorAccount, objectEventProjection, readDataKeys, verifyObjectDeletion, verifyObjectEvent } from './channelDataKeys';
 import { getResource, cacheResource, type SavedResource } from '../database';
 import { channelCache } from './resourceMetadata';
-import { loadWorkspace } from './workspaceStructure';
-import type { FileItem, Item, Snapshot } from '../types';
+import { cachedPerson, loadWorkspace } from './workspaceStructure';
+import { avatarThumbnail } from './senderSnapshot';
+import type { FileItem, Item, SenderInfo, Snapshot } from '../types';
 import { previewKindOf } from '@/lib/fileKind';
 import { blobs, readers } from './sessions';
 import { showRejected, publishWorkspace } from './presentation';
@@ -31,6 +32,15 @@ export function mapReceived(item: ReceivedItem): Item {
     text: new TextDecoder().decode(item.content) };
 }
 
+/** 别人发的消息:服务端登记了作者账号,先用它(和已加载的资料)显示名字,避免「未知成员」闪一下 */
+async function authorOf(resourceId: string, itemId: string): Promise<SenderInfo | undefined> {
+  const username = objectAuthorAccount(resourceId, itemId);
+  if (!username) return undefined;
+  const person = cachedPerson(resourceId, username);
+  const avatar = person?.avatar ? await avatarThumbnail(person.avatar) : undefined;
+  return { username, displayName: person?.displayName || username, ...(avatar ? { avatar } : {}) };
+}
+
 export async function applyChannelRecord(resource: SavedResource, session: ChannelSession, input: Uint8Array | LogRecord): Promise<void> {
   if (!(input instanceof Uint8Array)) {
     const itemId = input.kind === 'frame' ? toBase64Url(parseEnvelope(input.envelope).itemId) : input.itemId;
@@ -80,7 +90,8 @@ export async function applyChannelRecord(resource: SavedResource, session: Chann
         } else {
           const blob = item.kind === 'file' && event.item.complete ? new Blob([event.item.content], { type: item.mime }) : undefined;
           if (blob) blobs.set(`${resource.id}:${item.id}`, blob);
-          publishWorkspace(resource.id, { t: 'item', item });
+          const author = await authorOf(resource.id, item.id);
+          publishWorkspace(resource.id, { t: 'item', item: author ? { ...item, author } : item });
         }
         break;
       }
diff --git a/web/src/core-bridge/worker/workspaceStructure.ts b/web/src/core-bridge/worker/workspaceStructure.ts
index 6d95836..a546c80 100644
--- a/web/src/core-bridge/worker/workspaceStructure.ts
+++ b/web/src/core-bridge/worker/workspaceStructure.ts
@@ -28,6 +28,10 @@ async function publish(id: string, body: WorkspaceBody): Promise<WorkspaceBody>
 export async function cachedWorkspace(id: string): Promise<WorkspaceBody> {
   return current.get(id) ?? loadWorkspace(id);
 }
+/** 已加载的成员资料(没有时返回 undefined) */
+export function cachedPerson(id: string, username: string): WorkspaceBody['people'][number] | undefined {
+  return current.get(id)?.people.find(person => person.username === username);
+}
 export async function loadWorkspace(id: string): Promise<WorkspaceBody> {
   const { session } = await getSession(id);
   const body = await apiFetch(`/spaces/${id}/structure`, { headers: session.authHeaders('read') }).then(r => r.json() as Promise<WorkspaceBody>);