diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/domain/SysOssExt.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/domain/SysOssExt.java
new file mode 100644
index 000000000..15a95e760
--- /dev/null
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/domain/SysOssExt.java
@@ -0,0 +1,75 @@
+package org.dromara.system.domain;
+
+import lombok.Data;
+
+import java.io.Serial;
+import java.io.Serializable;
+import java.util.List;
+
+/**
+ * 附件扩展字段对象（存储在 SysOss.ext1 的 JSON 字符串中）
+ *
+ * @author AprilWind
+ */
+@Data
+public class SysOssExt implements Serializable {
+
+    @Serial
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * 所属业务类型（如 avatar、report、contract）
+     */
+    private String bizType;
+
+    /**
+     * 文件大小（单位：字节）
+     */
+    private Long fileSize;
+
+    /**
+     * 文件类型（MIME类型，如 image/png）
+     */
+    private String contentType;
+
+    /**
+     * 来源标识（如 userUpload、systemImport）
+     */
+    private String source;
+
+    /**
+     * 上传 IP 地址，便于审计和追踪
+     */
+    private String uploadIp;
+
+    /**
+     * 附件说明或备注
+     */
+    private String remark;
+
+    /**
+     * 附件标签，如 ["图片", "证件"]
+     */
+    private List<String> tags;
+
+    /**
+     * 业务绑定ID（如某业务记录ID）
+     */
+    private String refId;
+
+    /**
+     * 绑定业务类型
+     */
+    private String refType;
+
+    /**
+     * 是否为临时文件，用于区分正式或待清理
+     */
+    private Boolean isTemp;
+
+    /**
+     * 文件MD5值（可用于去重或校验）
+     */
+    private String md5;
+
+}
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
index 1f2bf80db..2e3f75c57 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
@@ -17,6 +17,7 @@ import org.dromara.common.core.utils.SpringUtils;
 import org.dromara.common.core.utils.StreamUtils;
 import org.dromara.common.core.utils.StringUtils;
 import org.dromara.common.core.utils.file.FileUtils;
+import org.dromara.common.json.utils.JsonUtils;
 import org.dromara.common.mybatis.core.page.PageQuery;
 import org.dromara.common.mybatis.core.page.TableDataInfo;
 import org.dromara.common.oss.core.OssClient;
@@ -24,6 +25,7 @@ import org.dromara.common.oss.entity.UploadResult;
 import org.dromara.common.oss.enums.AccessPolicyType;
 import org.dromara.common.oss.factory.OssFactory;
 import org.dromara.system.domain.SysOss;
+import org.dromara.system.domain.SysOssExt;
 import org.dromara.system.domain.bo.SysOssBo;
 import org.dromara.system.domain.vo.SysOssVo;
 import org.dromara.system.mapper.SysOssMapper;
@@ -199,8 +201,10 @@ public class SysOssServiceImpl implements ISysOssService, OssService {
         } catch (IOException e) {
             throw new ServiceException(e.getMessage());
         }
+        SysOssExt ext1 = new SysOssExt();
+        ext1.setFileSize(file.getSize());
         // 保存文件信息
-        return buildResultEntity(originalfileName, suffix, storage.getConfigKey(), uploadResult);
+        return buildResultEntity(originalfileName, suffix, storage.getConfigKey(), uploadResult, ext1);
     }
 
     /**
@@ -215,18 +219,21 @@ public class SysOssServiceImpl implements ISysOssService, OssService {
         String suffix = StringUtils.substring(originalfileName, originalfileName.lastIndexOf("."), originalfileName.length());
         OssClient storage = OssFactory.instance();
         UploadResult uploadResult = storage.uploadSuffix(file, suffix);
+        SysOssExt ext1 = new SysOssExt();
+        ext1.setFileSize(file.length());
         // 保存文件信息
-        return buildResultEntity(originalfileName, suffix, storage.getConfigKey(), uploadResult);
+        return buildResultEntity(originalfileName, suffix, storage.getConfigKey(), uploadResult, ext1);
     }
 
     @NotNull
-    private SysOssVo buildResultEntity(String originalfileName, String suffix, String configKey, UploadResult uploadResult) {
+    private SysOssVo buildResultEntity(String originalfileName, String suffix, String configKey, UploadResult uploadResult, SysOssExt ext1) {
         SysOss oss = new SysOss();
         oss.setUrl(uploadResult.getUrl());
         oss.setFileSuffix(suffix);
         oss.setFileName(uploadResult.getFilename());
         oss.setOriginalName(originalfileName);
         oss.setService(configKey);
+        oss.setExt1(JsonUtils.toJsonString(ext1));
         baseMapper.insert(oss);
         SysOssVo sysOssVo = MapstructUtils.convert(oss, SysOssVo.class);
         return this.matchingUrl(sysOssVo);