diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index bc4d8bc..1be01db 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -10,7 +10,10 @@
       "Bash(npx shadcn@latest add:*)",
       "Bash(npm --prefix /Users/aaron/source_code/hku-icb-class/frontend run build)",
       "Bash(/Users/aaron/source_code/hku-icb-class/frontend/node_modules/.bin/tsc --noEmit --project /Users/aaron/source_code/hku-icb-class/frontend/tsconfig.json)",
-      "Bash(test:*)"
+      "Bash(test:*)",
+      "Bash(/Users/aaron/source_code/hku-icb-class/backend/.venv/bin/python:*)",
+      "Bash(.venv/bin/python:*)",
+      "Bash(backend/.venv/bin/pip show:*)"
     ]
   }
 }
diff --git a/backend/.env.example b/backend/.env.example
index c3a1fde..c3da64b 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -20,7 +20,7 @@ CH_COS_BASE_URL=https://hku-icb-1311994147.cos.ap-guangzhou.myqcloud.com
 # SMTP Email
 CH_SMTP_HOST=gz-smtp.qcloudmail.com
 CH_SMTP_PORT=465
-CH_SMTP_USER=noreply
+CH_SMTP_USER=noreply@hkuicb.info
 CH_SMTP_PASSWORD=hX2gqEPjaRhULXF69
 CH_SMTP_FROM_EMAIL=noreply@hkuicb.info
 CH_SMTP_FROM_NAME=HKU ICB Class Hub
diff --git a/backend/app/api/resources.py b/backend/app/api/resources.py
index e3f231f..6d8f83d 100644
--- a/backend/app/api/resources.py
+++ b/backend/app/api/resources.py
@@ -1,4 +1,4 @@
-from fastapi import APIRouter, Depends, HTTPException, UploadFile, File
+from fastapi import APIRouter, Depends, HTTPException, UploadFile, File, Form
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.deps import require_role
@@ -76,11 +76,11 @@ async def get_resources(
 
 @router.post("/", response_model=ResourceOut)
 async def upload_new_resource(
-    title: str,
-    category: str,
     file: UploadFile = File(...),
-    description: str | None = None,
-    class_id: int | None = None,
+    title: str = Form(...),
+    category: str = Form(...),
+    description: str | None = Form(None),
+    class_id: int | None = Form(None),
     user: User = Depends(require_role("super_admin", "class_admin")),
     db: AsyncSession = Depends(get_db),
 ):
diff --git a/backend/app/services/announcement_service.py b/backend/app/services/announcement_service.py
index 424a849..2e831d2 100644
--- a/backend/app/services/announcement_service.py
+++ b/backend/app/services/announcement_service.py
@@ -21,10 +21,15 @@ async def create_announcement(
     await db.commit()
     await db.refresh(announcement)
 
-    # Send notifications to class members
+    # Send notifications + email to class members
+    content_preview = (data.content[:100] + "...") if data.content and len(data.content) > 100 else (data.content or "")
     await create_notifications_for_class(
         db, class_id, "announcement", f"新公告: {data.title}",
-        related_id=announcement.id, exclude_user_id=author_id,
+        content=content_preview,
+        related_id=announcement.id,
+        email_subject=f"HKU ICB - 新公告: {data.title}",
+        email_body=f"<p>{content_preview}</p>" if content_preview else None,
+        email_action_path="/announcements",
     )
 
     return announcement
diff --git a/backend/app/services/email_service.py b/backend/app/services/email_service.py
index 43b4cb4..28f0b20 100644
--- a/backend/app/services/email_service.py
+++ b/backend/app/services/email_service.py
@@ -57,3 +57,39 @@ async def send_approval_notification(student_email: str, approved: bool):
     await send_email(
         student_email, f"HKU ICB: Registration {status_text.capitalize()}", html
     )
+
+
+async def send_class_notification_email(
+    emails: list[str],
+    subject: str,
+    title: str,
+    body: str,
+    action_url: str | None = None,
+):
+    """Send a styled notification email to class members."""
+    action_html = ""
+    if action_url:
+        action_html = f"""
+        <div style="margin-top: 20px;">
+            <a href="{action_url}" style="display:inline-block;padding:10px 24px;background:#111827;color:#fff;border-radius:6px;text-decoration:none;font-size:14px;">
+                查看详情
+            </a>
+        </div>
+        """
+    html = f"""
+    <div style="max-width:600px;margin:0 auto;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:#1f2937;">
+        <div style="padding:24px 0;border-bottom:2px solid #111827;">
+            <h1 style="margin:0;font-size:20px;color:#111827;">HKU ICB</h1>
+        </div>
+        <div style="padding:24px 0;">
+            <h2 style="margin:0 0 12px;font-size:18px;">{title}</h2>
+            <div style="font-size:14px;line-height:1.6;color:#4b5563;">{body}</div>
+            {action_html}
+        </div>
+        <div style="padding:16px 0;border-top:1px solid #e5e7eb;font-size:12px;color:#9ca3af;">
+            此邮件由系统自动发送，请勿直接回复。
+        </div>
+    </div>
+    """
+    for email in emails:
+        await send_email(email, subject, html)
diff --git a/backend/app/services/notification_service.py b/backend/app/services/notification_service.py
index 697941c..f379b8a 100644
--- a/backend/app/services/notification_service.py
+++ b/backend/app/services/notification_service.py
@@ -1,7 +1,13 @@
+import asyncio
+import logging
+
 from sqlalchemy import select, func, update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.db.models import Notification, User
+from app.services.email_service import send_class_notification_email
+
+logger = logging.getLogger(__name__)
 
 
 async def create_notification(
@@ -33,19 +39,21 @@ async def create_notifications_for_class(
     content: str | None = None,
     related_id: int | None = None,
     exclude_user_id: int | None = None,
+    email_subject: str | None = None,
+    email_body: str | None = None,
+    email_action_path: str | None = None,
 ):
-    """Create notifications for all approved users in a class."""
+    """Create in-app notifications + send email for all approved users in a class."""
     result = await db.execute(
-        select(User.id).where(
+        select(User.id, User.email).where(
             User.class_id == class_id,
             User.status == "approved",
         )
     )
-    user_ids = [row[0] for row in result.all()]
+    rows = result.all()
 
-    for uid in user_ids:
-        if exclude_user_id and uid == exclude_user_id:
-            continue
+    emails: list[str] = []
+    for uid, email in rows:
         notification = Notification(
             user_id=uid,
             type=type,
@@ -54,9 +62,26 @@ async def create_notifications_for_class(
             related_id=related_id,
         )
         db.add(notification)
+        emails.append(email)
 
     await db.commit()
 
+    # Send email notification in background (fire-and-forget)
+    if email_subject and emails:
+        from app.config import settings
+        action_url = f"{settings.frontend_url}{email_action_path}" if email_action_path else None
+        asyncio.create_task(_safe_send_emails(emails, email_subject, title, email_body or content or "", action_url))
+
+
+async def _safe_send_emails(
+    emails: list[str], subject: str, title: str, body: str, action_url: str | None
+):
+    """Fire-and-forget email sending with error logging."""
+    try:
+        await send_class_notification_email(emails, subject, title, body, action_url)
+    except Exception as e:
+        logger.error(f"Failed to send class notification emails: {e}")
+
 
 async def list_notifications(
     db: AsyncSession, user_id: int, page: int = 1, page_size: int = 20
diff --git a/backend/app/services/schedule_service.py b/backend/app/services/schedule_service.py
index 49a5f59..e7f4a60 100644
--- a/backend/app/services/schedule_service.py
+++ b/backend/app/services/schedule_service.py
@@ -19,10 +19,16 @@ async def create_schedule(
     await db.commit()
     await db.refresh(item)
 
-    # Send notifications to class members
+    # Send notifications + email to class members
+    time_str = data.start_time.strftime("%Y-%m-%d %H:%M")
+    location_info = f" · {data.location}" if data.location else ""
     await create_notifications_for_class(
         db, class_id, "schedule", f"新排期: {data.title}",
+        content=f"{time_str}{location_info}",
         related_id=item.id,
+        email_subject=f"HKU ICB - 新排期: {data.title}",
+        email_body=f"<p><strong>{data.title}</strong></p><p>时间: {time_str}{location_info}</p>",
+        email_action_path="/schedule",
     )
 
     return item
diff --git a/backend/app/services/timeline_service.py b/backend/app/services/timeline_service.py
index 0aef37d..c092e3b 100644
--- a/backend/app/services/timeline_service.py
+++ b/backend/app/services/timeline_service.py
@@ -7,6 +7,7 @@ from sqlalchemy.orm import selectinload
 
 from app.db.models import Timeline, User
 from app.schemas.timeline import TimelineCreate, TimelineUpdate
+from app.services.notification_service import create_notifications_for_class
 
 
 async def create_timeline(
@@ -21,6 +22,18 @@ async def create_timeline(
     db.add(post)
     await db.commit()
     await db.refresh(post)
+
+    # Send notifications + email to class members
+    content_preview = (data.content[:100] + "...") if data.content and len(data.content) > 100 else (data.content or "")
+    await create_notifications_for_class(
+        db, class_id, "timeline", f"新大事件: {data.title}",
+        content=content_preview,
+        related_id=post.id,
+        email_subject=f"HKU ICB - 新大事件: {data.title}",
+        email_body=f"<p>{content_preview}</p>" if content_preview else None,
+        email_action_path="/timeline",
+    )
+
     return post