diff --git a/app/routers/web.py b/app/routers/web.py
index 6238225..696c600 100644
--- a/app/routers/web.py
+++ b/app/routers/web.py
@@ -339,6 +339,27 @@ def postcard_delete(postcard_id: int, user: User = Depends(get_current_user_web)
     return _redirect(f"/profiles/{pid}/postcards")
 
 
+@router.post("/postcards/{postcard_id}/mark-delivered")
+def mark_delivered(
+    postcard_id: int,
+    user: User = Depends(get_current_user_web),
+    db: Session = Depends(get_db),
+):
+    pc = (
+        db.query(Postcard)
+        .join(Profile)
+        .filter(Postcard.id == postcard_id, Profile.user_id == user.id)
+        .first()
+    )
+    if not pc:
+        return _redirect("/profiles")
+    pc.status = "delivered"
+    if not pc.arrival_time:
+        pc.arrival_time = datetime.now()
+    db.commit()
+    return _redirect(f"/postcards/{postcard_id}")
+
+
 # ---------- Image Upload ----------
 
 @router.post("/postcards/{postcard_id}/image/{side}")
diff --git a/app/templates/postcard_detail.html b/app/templates/postcard_detail.html
index 693d5af..834ebab 100644
--- a/app/templates/postcard_detail.html
+++ b/app/templates/postcard_detail.html
@@ -5,6 +5,11 @@
     <h1>{{ postcard.card_number }}</h1>
     <div>
         <a href="/postcards/{{ postcard.id }}/edit" class="btn">编辑</a>
+        {% if postcard.status == 'sent' %}
+        <form method="post" action="/postcards/{{ postcard.id }}/mark-delivered" class="inline">
+            <button type="submit" class="btn btn-primary" onclick="return confirm('确认已送达？')">标记已送达</button>
+        </form>
+        {% endif %}
         <form method="post" action="/postcards/{{ postcard.id }}/delete" class="inline">
             <button type="submit" class="btn btn-danger" onclick="return confirm('确定删除？')">删除</button>
         </form>
diff --git a/app/templates/postcards.html b/app/templates/postcards.html
index 6c67111..cefa665 100644
--- a/app/templates/postcards.html
+++ b/app/templates/postcards.html
@@ -34,6 +34,11 @@
             {% else %}
             <span>← {{ pc.sender_name or '-' }}</span>
             {% endif %}
+            {% if pc.status == 'sent' %}
+            <form method="post" action="/postcards/{{ pc.id }}/mark-delivered" class="inline" onclick="event.stopPropagation();">
+                <button type="submit" class="btn btn-sm btn-primary" onclick="return confirm('确认已送达？')">✓ 标记已送达</button>
+            </form>
+            {% endif %}
         </div>
     </a>
     {% endfor %}