diff --git a/backend/src/main/java/com/designhub/dto/PipelineTaskDTO.java b/backend/src/main/java/com/designhub/dto/PipelineTaskDTO.java
index 5e51e87..d482b69 100644
--- a/backend/src/main/java/com/designhub/dto/PipelineTaskDTO.java
+++ b/backend/src/main/java/com/designhub/dto/PipelineTaskDTO.java
@@ -45,6 +45,7 @@ public class PipelineTaskDTO {
     private String releaseType; // 发布类型：default/recruitment/assigned
     private Long receiverId; // 指定接收人ID（assigned模式使用）
     private List<String> productBarcodes; // 商品条码列表（已验证库存）
+    private String previewImage; // 预览图URL
 
     /**
      * 子任务项DTO
diff --git a/backend/src/main/java/com/designhub/service/TaskApprovalService.java b/backend/src/main/java/com/designhub/service/TaskApprovalService.java
index 6bd5bae..39e8d4b 100644
--- a/backend/src/main/java/com/designhub/service/TaskApprovalService.java
+++ b/backend/src/main/java/com/designhub/service/TaskApprovalService.java
@@ -629,7 +629,7 @@ public class TaskApprovalService {
     }
 
     /**
-     * 确定接单部门负责人
+     * 确定接单部门负责人（支持三级分类继承二级分类的配置）
      */
     private Long determineReceivingLeader(Task task) {
         // 根据任务类型的allowedDeptIds确定接单部门
@@ -644,13 +644,25 @@ public class TaskApprovalService {
             try {
                 Long typeId = Long.parseLong(typeIdStr.trim());
                 DemandType demandType = configService.getDemandTypeById(typeId);
-                if (demandType != null && demandType.getAllowedDeptIds() != null) {
-                    String[] deptIds = demandType.getAllowedDeptIds().split(",");
-                    if (deptIds.length > 0) {
-                        Long deptId = Long.parseLong(deptIds[0].trim());
-                        Department dept = departmentMapper.selectById(deptId);
-                        if (dept != null && dept.getLeaderId() != null) {
-                            return dept.getLeaderId();
+                if (demandType != null) {
+                    // 获取允许的部门ID（支持继承）
+                    String allowedDeptIds = demandType.getAllowedDeptIds();
+                    if ((allowedDeptIds == null || allowedDeptIds.isEmpty()) && demandType.getParentId() != null) {
+                        // 三级分类没有配置，尝试获取父级（二级分类）的配置
+                        DemandType parentType = configService.getDemandTypeById(demandType.getParentId());
+                        if (parentType != null) {
+                            allowedDeptIds = parentType.getAllowedDeptIds();
+                        }
+                    }
+                    
+                    if (allowedDeptIds != null && !allowedDeptIds.isEmpty()) {
+                        String[] deptIds = allowedDeptIds.split(",");
+                        if (deptIds.length > 0) {
+                            Long deptId = Long.parseLong(deptIds[0].trim());
+                            Department dept = departmentMapper.selectById(deptId);
+                            if (dept != null && dept.getLeaderId() != null) {
+                                return dept.getLeaderId();
+                            }
                         }
                     }
                 }
diff --git a/backend/src/main/java/com/designhub/service/TaskItemService.java b/backend/src/main/java/com/designhub/service/TaskItemService.java
index d0eb888..3531806 100644
--- a/backend/src/main/java/com/designhub/service/TaskItemService.java
+++ b/backend/src/main/java/com/designhub/service/TaskItemService.java
@@ -142,21 +142,33 @@ public class TaskItemService {
                 throw new BusinessException(ResultCode.FORBIDDEN, "部门负责人不能接单，请分配给设计师");
             }
 
-            // 检查4：验证部门是否允许接该任务类型
+            // 检查4：验证部门是否允许接该任务类型（支持三级分类继承二级分类的配置）
             if (item.getTaskTypeId() != null) {
                 com.designhub.entity.DemandType demandType = configService.getDemandTypeById(item.getTaskTypeId());
-                if (demandType != null && demandType.getAllowedDeptIds() != null && !demandType.getAllowedDeptIds().isEmpty()) {
-                    // 检查用户部门是否在允许列表中
-                    String[] allowedIds = demandType.getAllowedDeptIds().split(",");
-                    boolean isAllowed = false;
-                    for (String allowedId : allowedIds) {
-                        if (allowedId.trim().equals(String.valueOf(user.getDeptId()))) {
-                            isAllowed = true;
-                            break;
+                if (demandType != null) {
+                    // 获取允许的部门ID（支持继承）
+                    String allowedDeptIds = demandType.getAllowedDeptIds();
+                    if ((allowedDeptIds == null || allowedDeptIds.isEmpty()) && demandType.getParentId() != null) {
+                        // 三级分类没有配置，尝试获取父级（二级分类）的配置
+                        var parentType = configService.getDemandTypeById(demandType.getParentId());
+                        if (parentType != null) {
+                            allowedDeptIds = parentType.getAllowedDeptIds();
                         }
                     }
-                    if (!isAllowed) {
-                        throw new BusinessException(ResultCode.FORBIDDEN, "您的部门无权接收此类型的任务");
+                    
+                    if (allowedDeptIds != null && !allowedDeptIds.isEmpty()) {
+                        // 检查用户部门是否在允许列表中
+                        String[] allowedIds = allowedDeptIds.split(",");
+                        boolean isAllowed = false;
+                        for (String allowedId : allowedIds) {
+                            if (allowedId.trim().equals(String.valueOf(user.getDeptId()))) {
+                                isAllowed = true;
+                                break;
+                            }
+                        }
+                        if (!isAllowed) {
+                            throw new BusinessException(ResultCode.FORBIDDEN, "您的部门无权接收此类型的任务");
+                        }
                     }
                 }
             }
diff --git a/backend/src/main/java/com/designhub/service/TaskService.java b/backend/src/main/java/com/designhub/service/TaskService.java
index de5c4a3..c3c4c76 100644
--- a/backend/src/main/java/com/designhub/service/TaskService.java
+++ b/backend/src/main/java/com/designhub/service/TaskService.java
@@ -28,6 +28,7 @@ import java.time.LocalTime;
 import java.time.format.DateTimeFormatter;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.Random;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -295,6 +296,7 @@ public class TaskService {
         task.setSpuInfo(dto.getSpuInfo());
         task.setTaskSubType(dto.getTaskSubType());
         task.setAttachmentUrl(dto.getAttachmentUrl());
+        task.setPreviewImage(dto.getPreviewImage());
         task.setRemark(dto.getRemark());
         task.setPriority(dto.getPriority() != null ? dto.getPriority() : 1); // 默认优先级：1-普通
         
@@ -354,8 +356,17 @@ public class TaskService {
             com.designhub.dto.PipelineTaskDTO.TaskItemDTO itemDto = dto.getItems().get(i);
             var demandType = configService.getDemandTypeById(itemDto.getTaskTypeId());
             
-            // 获取当前任务类型的接单部门配置
+            // 获取当前任务类型的接单部门配置（支持三级分类继承二级分类的配置）
             String currentAllowedDeptIds = demandType.getAllowedDeptIds();
+            if (currentAllowedDeptIds == null && demandType.getParentId() != null) {
+                // 如果当前类型没有配置，尝试获取父级的配置
+                var parentType = configService.getDemandTypeById(demandType.getParentId());
+                if (parentType != null) {
+                    currentAllowedDeptIds = parentType.getAllowedDeptIds();
+                    log.info("三级分类 {} 继承父级 {} 的接单部门配置: {}", 
+                        demandType.getTypeName(), parentType.getTypeName(), currentAllowedDeptIds);
+                }
+            }
             
             // 判断是否需要创建新分组
             boolean needNewGroup = false;
@@ -651,12 +662,26 @@ public class TaskService {
                                    String timeRange, String sortBy, Long userDeptId) {
         Page<Task> pageParam = new Page<>(page, pageSize);
         
-        // 获取当前用户部门可以接单的任务类型ID列表
+        // 获取当前用户部门可以接单的任务类型ID列表（支持三级分类继承二级分类的配置）
         List<Long> allowedTaskTypeIds = null;
         if (userDeptId != null) {
-            allowedTaskTypeIds = demandTypeMapper.selectList(null).stream()
+            List<DemandType> allDemandTypes = demandTypeMapper.selectList(null);
+            // 构建ID到DemandType的映射，用于快速查找父级
+            Map<Long, DemandType> demandTypeMap = allDemandTypes.stream()
+                .collect(Collectors.toMap(DemandType::getId, dt -> dt));
+            
+            allowedTaskTypeIds = allDemandTypes.stream()
                 .filter(dt -> {
+                    // 获取允许的部门ID（支持继承）
                     String allowedDepts = dt.getAllowedDeptIds();
+                    if ((allowedDepts == null || allowedDepts.isEmpty()) && dt.getParentId() != null) {
+                        // 三级分类没有配置，尝试获取父级（二级分类）的配置
+                        DemandType parentType = demandTypeMap.get(dt.getParentId());
+                        if (parentType != null) {
+                            allowedDepts = parentType.getAllowedDeptIds();
+                        }
+                    }
+                    
                     // 如果allowedDeptIds为空，表示所有部门都可接单
                     if (allowedDepts == null || allowedDepts.isEmpty()) {
                         return true;