diff --git a/src/main/java/com/gaotao/modules/pms/controller/QcController.java b/src/main/java/com/gaotao/modules/pms/controller/QcController.java
index e09f1ca..44d88b7 100644
--- a/src/main/java/com/gaotao/modules/pms/controller/QcController.java
+++ b/src/main/java/com/gaotao/modules/pms/controller/QcController.java
@@ -21,6 +21,8 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 
+import javax.servlet.http.HttpServletResponse;
+import java.io.*;
 import java.util.*;
 
 @RestController
@@ -1807,6 +1809,64 @@ public class QcController {
         return R.ok().put("page", page);
     }
 
+    /**
+     * SOP文件预览/下载
+     * 根据文件路径读取文件内容并返回
+     **/
+    @PostMapping("/downloadSopFile")
+    public void downloadSopFile(@RequestParam("sopUrl") String sopUrl, HttpServletResponse response) {
+        if (sopUrl == null || sopUrl.isEmpty()) {
+            throw new RuntimeException("文件路径不能为空");
+        }
+        
+        File file = new File(sopUrl);
+        if (!file.exists()) {
+            throw new RuntimeException("文件不存在: " + sopUrl);
+        }
+        
+        // 获取文件后缀
+        String fileName = file.getName();
+        String fileSuffix = "";
+        if (fileName.contains(".")) {
+            fileSuffix = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
+        }
+        
+        // 设置响应类型
+        String contentType = "application/octet-stream";
+        if ("pdf".equals(fileSuffix)) {
+            contentType = "application/pdf";
+        } else if ("jpg".equals(fileSuffix) || "jpeg".equals(fileSuffix)) {
+            contentType = "image/jpeg";
+        } else if ("png".equals(fileSuffix)) {
+            contentType = "image/png";
+        } else if ("gif".equals(fileSuffix)) {
+            contentType = "image/gif";
+        } else if ("bmp".equals(fileSuffix)) {
+            contentType = "image/bmp";
+        } else if ("mp4".equals(fileSuffix)) {
+            contentType = "video/mp4";
+        } else if ("txt".equals(fileSuffix)) {
+            contentType = "text/plain";
+        }
+        
+        response.setContentType(contentType);
+        response.setHeader("Content-Disposition", "inline; filename=\"" + fileName + "\"");
+        
+        try (FileInputStream fis = new FileInputStream(file);
+             BufferedInputStream bis = new BufferedInputStream(fis);
+             OutputStream os = response.getOutputStream()) {
+            
+            byte[] buffer = new byte[4096];
+            int bytesRead;
+            while ((bytesRead = bis.read(buffer)) != -1) {
+                os.write(buffer, 0, bytesRead);
+            }
+            os.flush();
+        } catch (IOException e) {
+            throw new RuntimeException("文件读取失败: " + e.getMessage());
+        }
+    }
+
     /**
      * 查询可用的SOP文件
      **/