diff --git a/app/Http/Controllers/Business/SystemizationTodos.php b/app/Http/Controllers/Business/SystemizationTodos.php
index 1420c6aa..e1538461 100644
--- a/app/Http/Controllers/Business/SystemizationTodos.php
+++ b/app/Http/Controllers/Business/SystemizationTodos.php
@@ -106,27 +106,6 @@ class SystemizationTodos extends Controller
         });
         $items = $items->sortBy('hierarchy_order')->values();
         $positionGroups = $this->positionGroups($sequenceMap);
-        if ($filters['type_sequence'] > 0) {
-            $items = $items
-                ->filter(static fn (SystemizationTodo $todo): bool =>
-                    (int) $todo->type_sequence === $filters['type_sequence']
-                )
-                ->values();
-        }
-        if ($filters['content_sequence'] > 0) {
-            $items = $items
-                ->filter(static fn (SystemizationTodo $todo): bool =>
-                    (int) $todo->content_sequence === $filters['content_sequence']
-                )
-                ->values();
-        }
-        if ($filters['item_sequence'] > 0) {
-            $items = $items
-                ->filter(static fn (SystemizationTodo $todo): bool =>
-                    (int) $todo->item_sequence === $filters['item_sequence']
-                )
-                ->values();
-        }
 
         $base = SystemizationTodo::query();
         $categories = SystemizationTodo::query()
@@ -428,7 +407,11 @@ class SystemizationTodos extends Controller
         );
     }
 
-    private function contentSiblings(?string $category, ?string $section): Collection
+    private function contentSiblings(
+        ?string $category,
+        ?string $section,
+        ?int $excludeId = null,
+    ): Collection
     {
         $categoryKey = $this->hierarchyGroupKey($this->hierarchyLabel($category));
         $sectionKey = $this->hierarchyGroupKey($this->hierarchyLabel($section));
@@ -439,12 +422,54 @@ class SystemizationTodos extends Controller
             ->lockForUpdate()
             ->get()
             ->filter(fn (SystemizationTodo $todo): bool =>
-                $this->hierarchyGroupKey($this->hierarchyLabel($todo->category)) === $categoryKey
+                (int) $todo->id !== (int) $excludeId
+                && $this->hierarchyGroupKey($this->hierarchyLabel($todo->category)) === $categoryKey
                 && $this->hierarchyGroupKey($this->hierarchyLabel($todo->section)) === $sectionKey
             )
             ->values();
     }
 
+    private function positionForUpdate(
+        SystemizationTodo $todo,
+        int $targetPosition,
+        array &$data,
+    ): void {
+        $currentCategoryKey = $this->hierarchyGroupKey($this->hierarchyLabel($todo->category));
+        $currentSectionKey = $this->hierarchyGroupKey($this->hierarchyLabel($todo->section));
+        $targetCategoryKey = $this->hierarchyGroupKey($this->hierarchyLabel($data['category'] ?? null));
+        $targetSectionKey = $this->hierarchyGroupKey($this->hierarchyLabel($data['section'] ?? null));
+        $sameGroup = $currentCategoryKey === $targetCategoryKey
+            && $currentSectionKey === $targetSectionKey;
+
+        if ($sameGroup) {
+            $currentSiblings = $this->contentSiblings($todo->category, $todo->section);
+            $currentIndex = $currentSiblings->search(
+                static fn (SystemizationTodo $item): bool => (int) $item->id === (int) $todo->id
+            );
+            if ($currentIndex !== false && $targetPosition === ((int) $currentIndex + 1)) {
+                return;
+            }
+        }
+
+        $siblings = $this->contentSiblings(
+            $data['category'] ?? null,
+            $data['section'] ?? null,
+            (int) $todo->id,
+        );
+        if ($siblings->isEmpty()) {
+            $insertOrder = (int) SystemizationTodo::query()->max('sort_order') + 1;
+        } elseif ($targetPosition <= $siblings->count()) {
+            $insertOrder = (int) $siblings[$targetPosition - 1]->sort_order;
+        } else {
+            $insertOrder = (int) $siblings->max('sort_order') + 1;
+        }
+
+        SystemizationTodo::query()
+            ->where('sort_order', '>=', $insertOrder)
+            ->increment('sort_order');
+        $data['sort_order'] = $insertOrder;
+    }
+
     private function groupTodoIds(SystemizationTodo $todo, bool $includeSection): array
     {
         $categoryKey = $this->hierarchyGroupKey($this->hierarchyLabel($todo->category));
@@ -480,6 +505,7 @@ class SystemizationTodos extends Controller
     public function update(Request $request, SystemizationTodo $todo): RedirectResponse
     {
         $data = $this->validated($request);
+        $targetPosition = max(0, (int) ($data['position'] ?? 0));
         unset($data['position']);
         $data['updated_by'] = user_id();
         $this->normalizeCompletionDates($data);
@@ -500,7 +526,16 @@ class SystemizationTodos extends Controller
             }
         }
 
-        $todo->update($data);
+        DB::transaction(function () use ($todo, $data, $targetPosition): void {
+            $lockedTodo = SystemizationTodo::query()
+                ->lockForUpdate()
+                ->findOrFail($todo->id);
+            if ($targetPosition > 0) {
+                $this->positionForUpdate($lockedTodo, $targetPosition, $data);
+            }
+            $lockedTodo->update($data);
+            $todo->setRawAttributes($lockedTodo->getAttributes(), true);
+        });
         $this->storeAttachments($request, $todo);
 
         return $this->backToPage('待办事项已更新并定位。', 'success', $todo);
@@ -572,9 +607,6 @@ class SystemizationTodos extends Controller
             'assignees' => $this->peopleFilter('assignee'),
             'start_date' => $this->normalizeDateFilter(request('start_date')),
             'due_date' => $this->normalizeDateFilter(request('due_date')),
-            'type_sequence' => max(0, (int) request('type_sequence', 0)),
-            'content_sequence' => max(0, (int) request('content_sequence', 0)),
-            'item_sequence' => max(0, (int) request('item_sequence', 0)),
             'keyword' => trim((string) request('keyword', '')),
         ];
     }
diff --git a/resources/views/business/pages/systemization-todos.blade.php b/resources/views/business/pages/systemization-todos.blade.php
index 2c555b77..380637b1 100644
--- a/resources/views/business/pages/systemization-todos.blade.php
+++ b/resources/views/business/pages/systemization-todos.blade.php
@@ -215,9 +215,6 @@
                 <option value="{{ $category }}" @selected($todoFilters['category'] === $category)>{{ $category }}</option>
             @endforeach
         </select></label>
-        <label>类型序号<input type="number" name="type_sequence" min="1" step="1" value="{{ $todoFilters['type_sequence'] ?: '' }}" placeholder="如：1"></label>
-        <label>内容序号<input type="number" name="content_sequence" min="1" step="1" value="{{ $todoFilters['content_sequence'] ?: '' }}" placeholder="如：2"></label>
-        <label>待办序号<input type="number" name="item_sequence" min="1" step="1" value="{{ $todoFilters['item_sequence'] ?: '' }}" placeholder="如：3"></label>
         @php
             $selectedOwners = $todoOwners->filter(
                 static fn (string $owner): bool => in_array($owner, $todoFilters['owners'], true)
@@ -345,7 +342,7 @@
         <table class="sys-todo-table" aria-label="财务系统化待办清单">
             <thead>
             <tr>
-                <th scope="col">类型</th><th scope="col">内容</th><th scope="col">待办序号</th><th scope="col">待办事项</th><th scope="col">总负责人</th><th scope="col">责任人</th>
+                <th scope="col">类型</th><th scope="col">内容</th><th scope="col">待办事项序号</th><th scope="col">待办事项</th><th scope="col">总负责人</th><th scope="col">责任人</th>
                 <th scope="col">开始时间</th><th scope="col">完成时间</th><th scope="col">状态</th><th scope="col">完成情况</th><th scope="col">完成截图</th><th scope="col">备注</th>
             </tr>
             </thead>
@@ -363,6 +360,7 @@
                     };
                     $todoPayload = [
                         'id' => $item->id,
+                        'position' => (int) $item->item_sequence,
                         'category' => $item->category ?? '',
                         'section' => $sectionLabels[$loop->index] ?? '',
                         'title' => $titleLabels[$loop->index] ?? '',
@@ -489,7 +487,7 @@
                         </div>
                     </div>
                     <label class="sys-todo-field sys-todo-field--4">内容<textarea name="section" maxlength="255" rows="2" data-sys-todo-auto-grow></textarea></label>
-                    <label class="sys-todo-field sys-todo-field--2 sys-todo-position-field" data-sys-todo-position-field>新增位置
+                    <label class="sys-todo-field sys-todo-field--2 sys-todo-position-field" data-sys-todo-position-field>待办事项序号
                         <select name="position" data-sys-todo-position></select>
                     </label>
                     <label class="sys-todo-field sys-todo-field--3">状态<select name="status" required>@foreach ($todoStatuses as $status)<option value="{{ $status }}">{{ $status }}</option>@endforeach</select></label>
@@ -675,28 +673,28 @@
 
             function populatePositionOptions() {
                 positionSelect.replaceChildren();
-                positionSelect.disabled = !!currentTodoId;
-                if (currentTodoId) {
-                    positionField.hidden = true;
-                    return;
-                }
-
                 positionField.hidden = false;
+                positionSelect.disabled = false;
                 var group = currentPositionGroup();
                 var count = group ? Number(group.count || 0) : 0;
-                for (var index = 1; index <= count; index++) {
+                var positionCount = currentTodoId ? Math.max(count, 1) : count;
+                for (var index = 1; index <= positionCount; index++) {
                     var before = document.createElement('option');
                     before.value = String(index);
-                    before.textContent = '第 ' + index + ' 条前插入（原第 ' + index + ' 条及之后顺延）';
+                    before.textContent = currentTodoId
+                        ? '第 ' + index + ' 条'
+                        : '第 ' + index + ' 条前插入（原第 ' + index + ' 条及之后顺延）';
                     positionSelect.appendChild(before);
                 }
-                var end = document.createElement('option');
-                end.value = String(count + 1);
-                end.textContent = count > 0
-                    ? '添加到末尾（第 ' + (count + 1) + ' 条）'
-                    : '新增为第 1 条';
-                positionSelect.appendChild(end);
-                positionSelect.value = String(count + 1);
+                if (!currentTodoId) {
+                    var end = document.createElement('option');
+                    end.value = String(count + 1);
+                    end.textContent = count > 0
+                        ? '添加到末尾（第 ' + (count + 1) + ' 条）'
+                        : '新增为第 1 条';
+                    positionSelect.appendChild(end);
+                    positionSelect.value = String(count + 1);
+                }
             }
 
             function syncScrollRail() {
@@ -866,7 +864,6 @@
                 form.action = currentTodoId ? routes.update.replace('__TODO__', currentTodoId) : routes.store;
                 title.textContent = currentTodoId ? '编辑待办' : '新增待办';
                 deleteButton.hidden = !currentTodoId;
-                positionField.hidden = !!currentTodoId;
                 if (payload) {
                     setCategoryValue(payload.category);
                     setValue('section', payload.section);
@@ -887,6 +884,13 @@
                     setValue('status', '待办');
                 }
                 populatePositionOptions();
+                if (currentTodoId) {
+                    var requestedPosition = Number((payload && payload.position) || 1);
+                    positionSelect.value = String(Math.min(
+                        Math.max(requestedPosition, 1),
+                        Math.max(positionSelect.options.length, 1)
+                    ));
+                }
 
                 existing.replaceChildren();
                 ((payload && payload.attachments) || []).forEach(function (attachment) {
diff --git a/tests/Feature/Business/SystemizationTodosTest.php b/tests/Feature/Business/SystemizationTodosTest.php
index 4ed5ecea..739cabf5 100644
--- a/tests/Feature/Business/SystemizationTodosTest.php
+++ b/tests/Feature/Business/SystemizationTodosTest.php
@@ -28,9 +28,7 @@ class SystemizationTodosTest extends FeatureTestCase
             ->assertSeeText('从 Excel 同步待办')
             ->assertSeeText('总负责人')
             ->assertSeeText('责任人')
-            ->assertSeeText('类型序号')
-            ->assertSeeText('内容序号')
-            ->assertSeeText('待办序号')
+            ->assertSeeText('待办事项序号')
             ->assertSeeText('已逾期')
             ->assertSeeText('开始时间')
             ->assertSeeText('完成时间')
@@ -43,6 +41,10 @@ class SystemizationTodosTest extends FeatureTestCase
             ->assertSee('data-sys-todo-category-select', false)
             ->assertSee('data-sys-todo-new-category-input', false)
             ->assertSee('data-sys-todo-position', false)
+            ->assertSeeText('待办事项序号')
+            ->assertDontSee('name="type_sequence"', false)
+            ->assertDontSee('name="content_sequence"', false)
+            ->assertDontSee('name="item_sequence"', false)
             ->assertSee('data-sys-todo-group-edit', false)
             ->assertSee('id="sysTodoGroupDialog"', false)
             ->assertDontSee('sys-todo-table__clamp', false)
@@ -184,6 +186,34 @@ class SystemizationTodosTest extends FeatureTestCase
             $items[6]->fresh()->sort_order,
             $items[7]->fresh()->sort_order,
         );
+
+        $this->patch(route('business.systemization-todos.update', ['todo' => $items[7]->id]), [
+            'category' => '收入',
+            'section' => '平台收入核对',
+            'position' => 2,
+            'title' => '原待办 7',
+            'owner' => '晨曦',
+            'assignee' => '栎阳',
+            'status' => SystemizationTodo::STATUS_PENDING,
+        ])->assertRedirect();
+
+        $reordered = $this->get(route('business.pages.show', [
+            'section' => 'other',
+            'page' => 'systemization-todos',
+        ]))->assertOk()->viewData('content')['items']
+            ->where('category', '收入')
+            ->where('section', '平台收入核对')
+            ->values();
+        $this->assertSame([
+            '原待办 1',
+            '原待办 7',
+            '原待办 2',
+            '原待办 3',
+            '原待办 4',
+            '原待办 5',
+            '原待办 6',
+            '新增待办 7',
+        ], $reordered->pluck('title')->all());
     }
 
     public function test_type_and_content_cells_can_be_edited_for_the_whole_group(): void
@@ -278,7 +308,7 @@ class SystemizationTodosTest extends FeatureTestCase
         $pageResponse
             ->assertOk()
             ->assertSee('rowspan="2"', false)
-            ->assertSee('<th scope="col">内容</th><th scope="col">待办序号</th><th scope="col">待办事项</th>', false)
+            ->assertSee('<th scope="col">内容</th><th scope="col">待办事项序号</th><th scope="col">待办事项</th>', false)
             ->assertSee('sys-todo-table__type', false)
             ->assertSee('title="类型序号">1</span>', false)
             ->assertSee('title="内容序号">1</span>', false)
@@ -320,22 +350,6 @@ class SystemizationTodosTest extends FeatureTestCase
                 ->all(),
         );
 
-        $sequenceResponse = $this->get(route('business.pages.show', [
-            'section' => 'other',
-            'page' => 'systemization-todos',
-            'category' => '收入',
-            'item_sequence' => 2,
-        ]))->assertOk();
-        $sequenceContent = $sequenceResponse->viewData('content');
-        $this->assertSame(['2、收入事项 B'], $sequenceContent['items']->pluck('title')->all());
-
-        $typeSequenceContent = $this->get(route('business.pages.show', [
-            'section' => 'other',
-            'page' => 'systemization-todos',
-            'type_sequence' => 2,
-        ]))->assertOk()->viewData('content');
-        $this->assertSame(['3、成本事项'], $typeSequenceContent['items']->pluck('title')->all());
-
         $highlightedTodo = $pageItems->firstWhere('title', '2、收入事项 B');
         $this->get(route('business.pages.show', [
             'section' => 'other',
@@ -430,16 +444,6 @@ class SystemizationTodosTest extends FeatureTestCase
                 ->values()
                 ->all(),
         );
-        $contentResponse = $this->get(route('business.pages.show', [
-            'section' => 'other',
-            'page' => 'systemization-todos',
-            'type_sequence' => 1,
-            'content_sequence' => 2,
-        ]))->assertOk();
-        $this->assertSame(
-            [$secondContent->id],
-            $contentResponse->viewData('content')['items']->pluck('id')->all(),
-        );
         $this->assertSame(
             [$completed->id, $inProgress->id],
             $items