diff --git a/app/services/export_excel.py b/app/services/export_excel.py
index 7da5b53..20718e2 100644
--- a/app/services/export_excel.py
+++ b/app/services/export_excel.py
@@ -173,9 +173,12 @@ class ExportExcelService:
             if level_data.NYID not in nyid_level_map:
                 nyid_level_map[level_data.NYID] = level_data
 
-        # 7. 合并数据
-        all_settlement_records = []
+        # 7. 合并数据并按 work_site 分组
+        work_site_records = {}  # work_site -> [records]
         for section in sections:
+            # 获取工点名称
+            work_site = section.work_site or "未知工点"
+
             checkpoints = section_checkpoint_map.get(section.section_id, [])
             for checkpoint in checkpoints:
                 checkpoint.burial_date = TimeUtils.string_to_date_string(checkpoint.burial_date)
@@ -209,33 +212,46 @@ class ExportExcelService:
                     merged_record = self.merge_settlement_with_related_data(
                         db, settlement, section, checkpoint, level_data
                     )
-                    all_settlement_records.append(merged_record)
 
-        if not all_settlement_records:
+                    # 按 work_site 分组
+                    if work_site not in work_site_records:
+                        work_site_records[work_site] = []
+                    work_site_records[work_site].append(merged_record)
+
+        if not work_site_records:
             logger.warning("未能合并任何数据记录")
             raise DataNotFoundException("未能合并任何数据记录")
 
-        logger.info(f"共找到 {len(all_settlement_records)} 条沉降数据记录")
+        logger.info(f"共找到 {len(work_site_records)} 个工点，共 {sum(len(records) for records in work_site_records.values())} 条沉降数据记录")
 
-        # 转换为DataFrame
-        df = pd.DataFrame(all_settlement_records)
-
-        # 导出到Excel文件
+        # 导出到Excel文件（按 work_site 分工作簿）
         with pd.ExcelWriter(file_path, engine='openpyxl') as writer:
-            df.to_excel(writer, index=False, sheet_name='沉降数据')
+            for work_site, records in work_site_records.items():
+                # 将工作表名称转换为有效字符（Excel工作表名称不能包含：/、\、?、*、[、]等）
+                safe_work_site = work_site.replace('/', '_').replace('\\', '_').replace('?', '_').replace('*', '_').replace('[', '_').replace(']', '_')
+                if len(safe_work_site) > 31:  # Excel工作表名称最大长度限制
+                    safe_work_site = safe_work_site[:28] + "..."
 
-            # 自动调整列宽
-            worksheet = writer.sheets['沉降数据']
-            for column in worksheet.columns:
-                max_length = 0
-                column_letter = column[0].column_letter
-                for cell in column:
-                    try:
-                        if len(str(cell.value)) > max_length:
-                            max_length = len(str(cell.value))
-                    except:
-                        pass
-                adjusted_width = min(max_length + 2, 50)
-                worksheet.column_dimensions[column_letter].width = adjusted_width
+                logger.info(f"创建工作簿: {safe_work_site}，记录数: {len(records)}")
+
+                # 转换为DataFrame
+                df = pd.DataFrame(records)
+
+                # 写入工作簿
+                df.to_excel(writer, index=False, sheet_name=safe_work_site)
+
+                # 自动调整列宽
+                worksheet = writer.sheets[safe_work_site]
+                for column in worksheet.columns:
+                    max_length = 0
+                    column_letter = column[0].column_letter
+                    for cell in column:
+                        try:
+                            if len(str(cell.value)) > max_length:
+                                max_length = len(str(cell.value))
+                        except:
+                            pass
+                    adjusted_width = min(max_length + 2, 50)
+                    worksheet.column_dimensions[column_letter].width = adjusted_width
 
         logger.info("Excel文件生成完成")