diff --git a/app/router/private/avatar.py b/app/router/private/avatar.py
index c7d74ec..165339c 100644
--- a/app/router/private/avatar.py
+++ b/app/router/private/avatar.py
@@ -40,6 +40,11 @@ async def upload_avatar(
     # check file
     check_image(content, 5 * 1024 * 1024, 256, 256)
 
+    if url := current_user.avatar_url:
+        path = storage.get_file_name_by_url(url)
+        if path:
+            await storage.delete_file(path)
+
     filehash = hashlib.sha256(content).hexdigest()
     storage_path = f"avatars/{current_user.id}_{filehash}.png"
     if not await storage.is_exists(storage_path):
diff --git a/app/router/private/cover.py b/app/router/private/cover.py
index 2aa71ac..0a4c4ec 100644
--- a/app/router/private/cover.py
+++ b/app/router/private/cover.py
@@ -40,6 +40,11 @@ async def upload_cover(
     # check file
     check_image(content, 10 * 1024 * 1024, 3000, 2000)
 
+    if url := current_user.cover["url"]:
+        path = storage.get_file_name_by_url(url)
+        if path:
+            await storage.delete_file(path)
+
     filehash = hashlib.sha256(content).hexdigest()
     storage_path = f"cover/{current_user.id}_{filehash}.png"
     if not await storage.is_exists(storage_path):
diff --git a/app/router/private/team.py b/app/router/private/team.py
index 4b8100f..509b650 100644
--- a/app/router/private/team.py
+++ b/app/router/private/team.py
@@ -115,6 +115,11 @@ async def update_team(
 
     if flag:
         check_image(flag, 2 * 1024 * 1024, 240, 120)
+
+        if old_flag := team.flag_url:
+            path = storage.get_file_name_by_url(old_flag)
+            if path:
+                await storage.delete_file(path)
         filehash = hashlib.sha256(flag).hexdigest()
         storage_path = f"team_flag/{team.id}_{filehash}.png"
         if not await storage.is_exists(storage_path):
@@ -122,6 +127,11 @@ async def update_team(
         team.flag_url = await storage.get_file_url(storage_path)
     if cover:
         check_image(cover, 10 * 1024 * 1024, 3000, 2000)
+
+        if old_cover := team.cover_url:
+            path = storage.get_file_name_by_url(old_cover)
+            if path:
+                await storage.delete_file(path)
         filehash = hashlib.sha256(cover).hexdigest()
         storage_path = f"team_cover/{team.id}_{filehash}.png"
         if not await storage.is_exists(storage_path):
diff --git a/app/storage/aws_s3.py b/app/storage/aws_s3.py
index 4c8e6d9..aa76b21 100644
--- a/app/storage/aws_s3.py
+++ b/app/storage/aws_s3.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from urllib.parse import urlparse
+
 from .base import StorageService
 
 import aioboto3
@@ -101,3 +103,23 @@ class AWSS3StorageService(StorageService):
                 return url
             except ClientError as e:
                 raise RuntimeError(f"Failed to generate file URL: {e}")
+
+    def get_file_name_by_url(self, url: str) -> str | None:
+        parsed = urlparse(url)
+        path = parsed.path.lstrip("/")
+
+        # 1. 如果是 public_url_base 拼接出来的
+        if self.public_url_base and url.startswith(self.public_url_base.rstrip("/")):
+            return path
+
+        # 2. 如果是 S3 path-style: s3.amazonaws.com/<bucket>/<key>
+        if parsed.netloc == "s3.amazonaws.com":
+            parts = path.split("/", 1)
+            return parts[1] if len(parts) > 1 else None
+
+        # 3. 如果是 virtual-hosted-style: <bucket>.s3.<region>.amazonaws.com/<key>
+        if ".s3." in parsed.netloc or parsed.netloc.endswith(".s3.amazonaws.com"):
+            return path
+
+        # 4. 直接返回 path
+        return path or None
diff --git a/app/storage/base.py b/app/storage/base.py
index 534d7a1..5987e8b 100644
--- a/app/storage/base.py
+++ b/app/storage/base.py
@@ -30,5 +30,9 @@ class StorageService(abc.ABC):
     async def get_file_url(self, file_path: str) -> str:
         raise NotImplementedError
 
+    @abc.abstractmethod
+    def get_file_name_by_url(self, url: str) -> str | None:
+        raise NotImplementedError
+
     async def close(self) -> None:
         pass
diff --git a/app/storage/cloudflare_r2.py b/app/storage/cloudflare_r2.py
index fbb08c7..ddb95ed 100644
--- a/app/storage/cloudflare_r2.py
+++ b/app/storage/cloudflare_r2.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from urllib.parse import urlparse
+
 from .aws_s3 import AWSS3StorageService
 
 
@@ -24,3 +26,18 @@ class CloudflareR2StorageService(AWSS3StorageService):
     @property
     def endpoint_url(self) -> str:
         return f"https://{self.account_id}.r2.cloudflarestorage.com"
+
+    def get_file_name_by_url(self, url: str) -> str | None:
+        if not url:
+            return None
+
+        parsed = urlparse(url)
+        path = parsed.path.lstrip("/")
+
+        if self.public_url_base and url.startswith(self.public_url_base.rstrip("/")):
+            return path
+
+        if ".r2.cloudflarestorage.com" in parsed.netloc:
+            return path
+
+        return path or None
diff --git a/app/storage/local.py b/app/storage/local.py
index b60eb35..af0e8ed 100644
--- a/app/storage/local.py
+++ b/app/storage/local.py
@@ -78,3 +78,8 @@ class LocalStorageService(StorageService):
 
     async def get_file_url(self, file_path: str) -> str:
         return f"{settings.server_url}file/{file_path.lstrip('/')}"
+
+    def get_file_name_by_url(self, url: str) -> str | None:
+        if not url.startswith(str(settings.server_url)):
+            return None
+        return url[len(settings.server_url) + len("file/") :]