diff --git a/backend/src/main/java/com/designhub/service/TaskItemService.java b/backend/src/main/java/com/designhub/service/TaskItemService.java
index 932e6eb..c850d04 100644
--- a/backend/src/main/java/com/designhub/service/TaskItemService.java
+++ b/backend/src/main/java/com/designhub/service/TaskItemService.java
@@ -44,6 +44,8 @@ public class TaskItemService {
     private final ExternalAssetService externalAssetService;
     private final SystemConfigService systemConfigService;
     private final DemandTypeMapper demandTypeMapper;
+    private final com.designhub.mapper.DeptBrandRelationMapper deptBrandRelationMapper;
+    private final com.designhub.mapper.UserDepartmentMapper userDepartmentMapper;
     private final com.designhub.mapper.UserMapper userMapper;
     private final ObjectMapper objectMapper;
     private final com.designhub.util.WorkHoursCalculator workHoursCalculator;
@@ -1931,7 +1933,8 @@ public class TaskItemService {
                         com.designhub.entity.User detailCompleter = userMapper.selectById(mainTask.getDetailCompleterId());
                         if (detailCompleter != null) {
                             groupInfo.put("publisherName", detailCompleter.getRealName());
-                            groupInfo.put("publisherDeptName", detailCompleter.getDeptName());
+                            groupInfo.put("publisherDeptName",
+                                resolveDisplayPublisherDeptName(mainTask, mainTask.getDetailCompleterId(), mainTask.getPublisherDeptId()));
                         }
                     } else {
                         // 普通任务：发起人 = 原始发起人
@@ -1940,7 +1943,8 @@ public class TaskItemService {
                             com.designhub.entity.User publisher = userMapper.selectById(mainTask.getPublisherId());
                             if (publisher != null) {
                                 groupInfo.put("publisherName", publisher.getRealName());
-                                groupInfo.put("publisherDeptName", publisher.getDeptName());
+                                groupInfo.put("publisherDeptName",
+                                    resolveDisplayPublisherDeptName(mainTask, mainTask.getPublisherId(), mainTask.getPublisherDeptId()));
                             }
                         }
                     }
@@ -2042,6 +2046,112 @@ public class TaskItemService {
 
         return new java.util.ArrayList<>(groupMap.values());
     }
+
+    private String resolveDisplayPublisherDeptName(Task mainTask, Long displayUserId, Long fallbackDeptId) {
+        if (displayUserId == null) {
+            return fallbackDeptId != null ? getDepartmentNameById(fallbackDeptId) : null;
+        }
+
+        com.designhub.entity.Department displayDept =
+            resolveDemandDepartmentForTaskUser(displayUserId, mainTask != null ? mainTask.getBrandId() : null, fallbackDeptId);
+        if (displayDept != null) {
+            return displayDept.getDeptName();
+        }
+
+        if (fallbackDeptId != null) {
+            String fallbackDeptName = getDepartmentNameById(fallbackDeptId);
+            if (fallbackDeptName != null) {
+                return fallbackDeptName;
+            }
+        }
+
+        com.designhub.entity.User user = userMapper.selectById(displayUserId);
+        return user != null ? user.getDeptName() : null;
+    }
+
+    private com.designhub.entity.Department resolveDemandDepartmentForTaskUser(Long userId, Long brandId, Long fallbackDeptId) {
+        if (userId == null) {
+            return null;
+        }
+
+        List<com.designhub.entity.UserDepartment> userDepartments = userDepartmentMapper.selectList(
+            new LambdaQueryWrapper<com.designhub.entity.UserDepartment>()
+                .eq(com.designhub.entity.UserDepartment::getUserId, userId)
+                .orderByDesc(com.designhub.entity.UserDepartment::getIsPrimary)
+                .orderByAsc(com.designhub.entity.UserDepartment::getId)
+        );
+
+        if (userDepartments == null || userDepartments.isEmpty()) {
+            return null;
+        }
+
+        List<com.designhub.entity.Department> demandDepartments = new java.util.ArrayList<>();
+        com.designhub.entity.Department primaryDemandDepartment = null;
+
+        for (com.designhub.entity.UserDepartment userDepartment : userDepartments) {
+            if (userDepartment == null || userDepartment.getDeptId() == null) {
+                continue;
+            }
+
+            com.designhub.entity.Department department = departmentMapper.selectById(userDepartment.getDeptId());
+            if (!isActiveDemandDepartment(department)) {
+                continue;
+            }
+
+            demandDepartments.add(department);
+            if (primaryDemandDepartment == null && Integer.valueOf(1).equals(userDepartment.getIsPrimary())) {
+                primaryDemandDepartment = department;
+            }
+        }
+
+        if (demandDepartments.isEmpty()) {
+            return null;
+        }
+
+        if (brandId != null) {
+            for (com.designhub.entity.Department department : demandDepartments) {
+                List<Long> brandIds = deptBrandRelationMapper.getBrandIdsByDeptId(department.getId());
+                if (brandIds != null && brandIds.contains(brandId)) {
+                    return department;
+                }
+            }
+        }
+
+        if (fallbackDeptId != null) {
+            for (com.designhub.entity.Department department : demandDepartments) {
+                if (fallbackDeptId.equals(department.getId())) {
+                    return department;
+                }
+            }
+        }
+
+        if (primaryDemandDepartment != null) {
+            return primaryDemandDepartment;
+        }
+
+        return demandDepartments.get(0);
+    }
+
+    private boolean isActiveDemandDepartment(com.designhub.entity.Department department) {
+        if (department == null) {
+            return false;
+        }
+        if (department.getStatus() == null || department.getStatus() != 1) {
+            return false;
+        }
+        if (department.getDeleted() != null && department.getDeleted() == 1) {
+            return false;
+        }
+        return "demand".equals(department.getDeptType()) || "primary_demand".equals(department.getDeptType());
+    }
+
+    private String getDepartmentNameById(Long deptId) {
+        if (deptId == null) {
+            return null;
+        }
+        com.designhub.entity.Department department = departmentMapper.selectById(deptId);
+        return department != null ? department.getDeptName() : null;
+    }
     
     /**
      * 从子任务编号解析部门序号