diff --git a/src/main/java/cc/ryanc/halo/model/entity/Attachment.java b/src/main/java/cc/ryanc/halo/model/entity/Attachment.java
index 4e0b61942..3e2696030 100644
--- a/src/main/java/cc/ryanc/halo/model/entity/Attachment.java
+++ b/src/main/java/cc/ryanc/halo/model/entity/Attachment.java
@@ -41,6 +41,12 @@ public class Attachment extends BaseEntity {
     @Column(name = "path", columnDefinition = "varchar(1023) not null")
     private String path;
 
+    /**
+     * File key: oss file key or local file key (Just for deleting)
+     */
+    @Column(name = "file_key", columnDefinition = "varchar(2047) default ''")
+    private String fileKey;
+
     /**
      * 缩略图路径
      */
@@ -88,6 +94,10 @@ public class Attachment extends BaseEntity {
         super.prePersist();
         id = null;
 
+        if (fileKey == null) {
+            fileKey = "";
+        }
+
         if (thumbPath == null) {
             thumbPath = "";
         }
@@ -107,7 +117,5 @@ public class Attachment extends BaseEntity {
         if (type == null) {
             type = AttachmentType.SERVER;
         }
-
     }
-
 }
diff --git a/src/main/java/cc/ryanc/halo/model/support/UploadResult.java b/src/main/java/cc/ryanc/halo/model/support/UploadResult.java
index 87c528b4d..2c7ae3946 100644
--- a/src/main/java/cc/ryanc/halo/model/support/UploadResult.java
+++ b/src/main/java/cc/ryanc/halo/model/support/UploadResult.java
@@ -16,6 +16,8 @@ public class UploadResult {
 
     private String filePath;
 
+    private String key;
+
     private String thumbPath;
 
     private String suffix;
diff --git a/src/main/java/cc/ryanc/halo/service/upload/FileHandler.java b/src/main/java/cc/ryanc/halo/service/upload/FileHandler.java
new file mode 100644
index 000000000..11c3559d3
--- /dev/null
+++ b/src/main/java/cc/ryanc/halo/service/upload/FileHandler.java
@@ -0,0 +1,33 @@
+package cc.ryanc.halo.service.upload;
+
+import cc.ryanc.halo.exception.FileUploadException;
+import cc.ryanc.halo.model.support.UploadResult;
+import org.springframework.lang.NonNull;
+import org.springframework.web.multipart.MultipartFile;
+
+/**
+ * File handler interface.
+ *
+ * @author johnniang
+ * @date 3/27/19
+ */
+public interface FileHandler {
+
+    /**
+     * Uploads file.
+     *
+     * @param file multipart file must not be null
+     * @return upload result
+     * @throws FileUploadException throws when fail to upload the file
+     */
+    @NonNull
+    UploadResult upload(@NonNull MultipartFile file);
+
+    /**
+     * Deletes file.
+     *
+     * @param key file key must not be null
+     */
+    boolean delete(@NonNull String key);
+
+}
diff --git a/src/main/java/cc/ryanc/halo/service/upload/LocalFileHandler.java b/src/main/java/cc/ryanc/halo/service/upload/LocalFileHandler.java
new file mode 100644
index 000000000..b8743ddbf
--- /dev/null
+++ b/src/main/java/cc/ryanc/halo/service/upload/LocalFileHandler.java
@@ -0,0 +1,30 @@
+package cc.ryanc.halo.service.upload;
+
+import cc.ryanc.halo.model.support.UploadResult;
+import cc.ryanc.halo.service.OptionService;
+import org.springframework.web.multipart.MultipartFile;
+
+/**
+ * Local file handler.
+ *
+ * @author johnniang
+ * @date 3/27/19
+ */
+public class LocalFileHandler implements FileHandler {
+
+    private final OptionService optionService;
+
+    public LocalFileHandler(OptionService optionService) {
+        this.optionService = optionService;
+    }
+
+    @Override
+    public UploadResult upload(MultipartFile file) {
+        return null;
+    }
+
+    @Override
+    public boolean delete(String key) {
+        return false;
+    }
+}
diff --git a/src/main/java/cc/ryanc/halo/service/upload/QnYunFileHandler.java b/src/main/java/cc/ryanc/halo/service/upload/QnYunFileHandler.java
new file mode 100644
index 000000000..1ad6bfff7
--- /dev/null
+++ b/src/main/java/cc/ryanc/halo/service/upload/QnYunFileHandler.java
@@ -0,0 +1,30 @@
+package cc.ryanc.halo.service.upload;
+
+import cc.ryanc.halo.model.support.UploadResult;
+import cc.ryanc.halo.service.OptionService;
+import org.springframework.web.multipart.MultipartFile;
+
+/**
+ * Qi niu yun file handler.
+ *
+ * @author johnniang
+ * @date 3/27/19
+ */
+public class QnYunFileHandler implements FileHandler {
+
+    private final OptionService optionService;
+
+    public QnYunFileHandler(OptionService optionService) {
+        this.optionService = optionService;
+    }
+
+    @Override
+    public UploadResult upload(MultipartFile file) {
+        return null;
+    }
+
+    @Override
+    public boolean delete(String key) {
+        return false;
+    }
+}
diff --git a/src/main/java/cc/ryanc/halo/service/upload/UpYunFileHandler.java b/src/main/java/cc/ryanc/halo/service/upload/UpYunFileHandler.java
new file mode 100644
index 000000000..de0c637d5
--- /dev/null
+++ b/src/main/java/cc/ryanc/halo/service/upload/UpYunFileHandler.java
@@ -0,0 +1,30 @@
+package cc.ryanc.halo.service.upload;
+
+import cc.ryanc.halo.model.support.UploadResult;
+import cc.ryanc.halo.service.OptionService;
+import org.springframework.web.multipart.MultipartFile;
+
+/**
+ * Up Yun file handler.
+ *
+ * @author johnniang
+ * @date 3/27/19
+ */
+public class UpYunFileHandler implements FileHandler {
+
+    private final OptionService optionService;
+
+    public UpYunFileHandler(OptionService optionService) {
+        this.optionService = optionService;
+    }
+
+    @Override
+    public UploadResult upload(MultipartFile file) {
+        return null;
+    }
+
+    @Override
+    public boolean delete(String key) {
+        return false;
+    }
+}