diff --git a/src/main/java/com/ycwl/basic/storage/adapters/AliOssAdapter.java b/src/main/java/com/ycwl/basic/storage/adapters/AliOssAdapter.java
index 8b7dd2c..4b6c170 100644
--- a/src/main/java/com/ycwl/basic/storage/adapters/AliOssAdapter.java
+++ b/src/main/java/com/ycwl/basic/storage/adapters/AliOssAdapter.java
@@ -35,6 +35,11 @@ import java.util.stream.Collectors;
 final public class AliOssAdapter extends AStorageAdapter {
     private AliOssStorageConfig config;
 
+    @Override
+    public String identity() {
+        return config.identity();
+    }
+
     @Override
     public void loadConfig(Map<String, String> _config) {
         AliOssStorageConfig config = new AliOssStorageConfig();
diff --git a/src/main/java/com/ycwl/basic/storage/adapters/AwsOssAdapter.java b/src/main/java/com/ycwl/basic/storage/adapters/AwsOssAdapter.java
index 2104ab5..a359787 100644
--- a/src/main/java/com/ycwl/basic/storage/adapters/AwsOssAdapter.java
+++ b/src/main/java/com/ycwl/basic/storage/adapters/AwsOssAdapter.java
@@ -28,6 +28,11 @@ import java.util.stream.Collectors;
 public class AwsOssAdapter extends AStorageAdapter {
     private AwsOssStorageConfig config;
 
+    @Override
+    public String identity() {
+        return config.identity();
+    }
+
     @Override
     public void loadConfig(Map<String, String> _config) {
         AwsOssStorageConfig config = new AwsOssStorageConfig();
diff --git a/src/main/java/com/ycwl/basic/storage/adapters/IStorageAdapter.java b/src/main/java/com/ycwl/basic/storage/adapters/IStorageAdapter.java
index d0f8e09..bcdc1dc 100644
--- a/src/main/java/com/ycwl/basic/storage/adapters/IStorageAdapter.java
+++ b/src/main/java/com/ycwl/basic/storage/adapters/IStorageAdapter.java
@@ -12,6 +12,7 @@ import java.util.List;
 import java.util.Map;
 
 public interface IStorageAdapter {
+    String identity();
     void loadConfig(Map<String, String> config);
     void setConfig(StorageConfig config);
     String uploadFile(String contentType, InputStream inputStream, String ...path);
diff --git a/src/main/java/com/ycwl/basic/storage/adapters/LocalStorageAdapter.java b/src/main/java/com/ycwl/basic/storage/adapters/LocalStorageAdapter.java
index a32644f..49e9883 100644
--- a/src/main/java/com/ycwl/basic/storage/adapters/LocalStorageAdapter.java
+++ b/src/main/java/com/ycwl/basic/storage/adapters/LocalStorageAdapter.java
@@ -11,6 +11,11 @@ import java.util.List;
 import java.util.Map;
 
 public class LocalStorageAdapter extends AStorageAdapter{
+    @Override
+    public String identity() {
+        return "";
+    }
+
     @Override
     public void loadConfig(Map<String, String> config) {
 
diff --git a/src/main/java/com/ycwl/basic/storage/entity/AliOssStorageConfig.java b/src/main/java/com/ycwl/basic/storage/entity/AliOssStorageConfig.java
index b2d2163..fabf4aa 100644
--- a/src/main/java/com/ycwl/basic/storage/entity/AliOssStorageConfig.java
+++ b/src/main/java/com/ycwl/basic/storage/entity/AliOssStorageConfig.java
@@ -1,5 +1,6 @@
 package com.ycwl.basic.storage.entity;
 
+import cn.hutool.crypto.digest.MD5;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 
@@ -19,6 +20,11 @@ public class AliOssStorageConfig extends StorageConfig {
         // TODO: 检查配置是否正确
     }
 
+    @Override
+    public String identity() {
+        return MD5.create().digestHex16(accessKeyId + bucketName + prefix);
+    }
+
     public String getUrl() {
         String url = this.url;
         if (url == null) {
diff --git a/src/main/java/com/ycwl/basic/storage/entity/AwsOssStorageConfig.java b/src/main/java/com/ycwl/basic/storage/entity/AwsOssStorageConfig.java
index 643871c..c8e6ec7 100644
--- a/src/main/java/com/ycwl/basic/storage/entity/AwsOssStorageConfig.java
+++ b/src/main/java/com/ycwl/basic/storage/entity/AwsOssStorageConfig.java
@@ -1,5 +1,6 @@
 package com.ycwl.basic.storage.entity;
 
+import cn.hutool.crypto.digest.MD5;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 
@@ -19,6 +20,11 @@ public class AwsOssStorageConfig extends StorageConfig {
         // TODO: 检查配置是否正确
     }
 
+    @Override
+    public String identity() {
+        return MD5.create().digestHex16(accessKeyId + bucketName + prefix);
+    }
+
     public String getUrl() {
         String url = this.url;
         if (url == null) {
diff --git a/src/main/java/com/ycwl/basic/storage/entity/StorageConfig.java b/src/main/java/com/ycwl/basic/storage/entity/StorageConfig.java
index 96b16eb..140a41c 100644
--- a/src/main/java/com/ycwl/basic/storage/entity/StorageConfig.java
+++ b/src/main/java/com/ycwl/basic/storage/entity/StorageConfig.java
@@ -2,4 +2,5 @@ package com.ycwl.basic.storage.entity;
 
 public abstract class StorageConfig {
     public abstract void checkEverythingOK();
+    public abstract String identity();
 }