diff --git a/servers/boe-server-all/src/main/java/com/xboe/module/course/api/CoursePortalApi.java b/servers/boe-server-all/src/main/java/com/xboe/module/course/api/CoursePortalApi.java
index eb72f82b..3e93694e 100644
--- a/servers/boe-server-all/src/main/java/com/xboe/module/course/api/CoursePortalApi.java
+++ b/servers/boe-server-all/src/main/java/com/xboe/module/course/api/CoursePortalApi.java
@@ -19,9 +19,7 @@ import com.xboe.core.orm.FieldFilters;
 import com.xboe.module.course.entity.*;
 import com.xboe.module.course.vo.TeacherVo;
 import com.xboe.school.study.dao.StudyCourseDao;
-import com.xboe.school.study.dao.StudySignupDao;
 import com.xboe.school.study.entity.StudyHomeWork;
-import com.xboe.school.study.entity.StudySignup;
 import com.xboe.school.study.service.IStudyHomeWorkService;
 import com.xboe.school.study.service.IStudyService;
 import com.xboe.system.user.entity.User;
@@ -394,6 +392,14 @@ public class CoursePortalApi extends ApiBaseController{
 			e.printStackTrace();
 			throw new RuntimeException("导出异常"+e.getMessage());
 		}
+		long totalFileSize = map.values().stream()
+				.mapToLong(path -> new File(path).length())
+				.sum();
+		// 检查文件总大小是否超过 2GB
+		if (totalFileSize > 2L * 1024 * 1024 * 1024) {
+			return success("您要下载的作业过大,请分批下载或联系管理员!");
+		}
+
 		String encodedFilename = URLEncoder.encode(courseName+"【作业】.zip")
 				.replace("+", "%20") // 空格替换为"%20"
 				.replace("%2F", "/"); // 解决斜杠问题
@@ -407,15 +413,9 @@ public class CoursePortalApi extends ApiBaseController{
         // 设置响应类型和Content-Disposition头
 		response.setContentType("application/zip");
 		response.setHeader("Content-Disposition", contentDispositionValue.toString());
-		long totalCompressedSize = 0;
 		try (ZipOutputStream zos = new ZipOutputStream(response.getOutputStream())) {
 			for (Map.Entry<String, String> e : map.entrySet()) {
 				File fileToZip = new File(e.getValue());
-				// 检查加上当前文件大小后，是否会超过2GB
-				long fileSizeInBytes = fileToZip.length();
-				if (totalCompressedSize + fileSizeInBytes > 2L * 1024 * 1024 * 1024) {
-					return success("您要下载的作业过大,联系管理员!");
-				}
 				// 添加 ZIP 条目
 				ZipEntry entry = new ZipEntry(e.getKey());
 				entry.setSize(fileToZip.length());
@@ -427,7 +427,6 @@ public class CoursePortalApi extends ApiBaseController{
 					int len;
 					while ((len = fis.read(buffer)) > 0) {
 						zos.write(buffer, 0, len);
-						totalCompressedSize += len;
 					}
 				}