diff --git a/lib/activity.dart b/lib/activity.dart
index 258a5ac..20aafa7 100644
--- a/lib/activity.dart
+++ b/lib/activity.dart
@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'activity_submit.dart';
 
 class ActivityListPage extends StatefulWidget {
   const ActivityListPage({Key? key}) : super(key: key);
@@ -93,7 +94,7 @@ class _ActivityListPageState extends State<ActivityListPage> {
               children: [
                 TextButton(
                   onPressed: () {
-                    // TODO: 導向詳情頁
+                    // TODO : 查看詳情
                   },
                   style: ElevatedButton.styleFrom(
                     backgroundColor: Colors.transparent,
@@ -110,20 +111,27 @@ class _ActivityListPageState extends State<ActivityListPage> {
                   ),
                   child: const Text('查看詳情'),
                 ),
-                const SizedBox(width: 8),
-                if (canRegister && id != null)
+                if (canRegister && id != null) ...[
+                  const SizedBox(width: 8),
                   ElevatedButton(
                     onPressed: () => openRegisterModal(id),
                     style: ElevatedButton.styleFrom(
                       backgroundColor: Colors.green,
                       shadowColor: Colors.transparent,
+                      shape: RoundedRectangleBorder(
+                        borderRadius: BorderRadius.circular(16),
+                      ),
                       padding: const EdgeInsets.symmetric(
                         horizontal: 20,
                         vertical: 12,
                       ),
                     ),
-                    child: const Text('我要報名'),
+                    child: const Text(
+                      '我要報名',
+                      style: TextStyle(color: Colors.white),
+                    ),
                   ),
+                ],
               ],
             ),
           ],
@@ -188,7 +196,13 @@ class _ActivityListPageState extends State<ActivityListPage> {
                         alignment: Alignment.centerRight,
                         child: ElevatedButton.icon(
                           onPressed: () {
-                            // TODO: 導向提交活動頁
+                            Navigator.push(
+                              context,
+                              MaterialPageRoute(
+                                builder:
+                                    (context) => const ActivitySubmitPage(),
+                              ),
+                            );
                           },
                           icon: const Icon(Icons.add),
                           label: const Text('提交活動申請'),
diff --git a/lib/activity_submit.dart b/lib/activity_submit.dart
new file mode 100644
index 0000000..f1943a7
--- /dev/null
+++ b/lib/activity_submit.dart
@@ -0,0 +1,224 @@
+import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+import 'dart:io';
+
+class ActivitySubmitPage extends StatefulWidget {
+  const ActivitySubmitPage({super.key});
+
+  @override
+  State<ActivitySubmitPage> createState() => _ActivitySubmitPageState();
+}
+
+class _ActivitySubmitPageState extends State<ActivitySubmitPage> {
+  final _formKey = GlobalKey<FormState>();
+  final _titleController = TextEditingController();
+  final _locationController = TextEditingController();
+  final _descriptionController = TextEditingController();
+  DateTime? _startDate;
+  DateTime? _endDate;
+  String _needRegister = '否';
+  String _repeatOption = 'none';
+  int _repeatCount = 1;
+  File? _poster;
+
+  Future<void> _selectDateTime(bool isStart) async {
+    final now = DateTime.now();
+    final date = await showDatePicker(
+      context: context,
+      initialDate: now,
+      firstDate: now,
+      lastDate: DateTime(now.year + 2),
+    );
+    if (date == null) return;
+
+    final time = await showTimePicker(
+      context: context,
+      initialTime: TimeOfDay.fromDateTime(now),
+    );
+    if (time == null) return;
+
+    final selected = DateTime(
+      date.year,
+      date.month,
+      date.day,
+      time.hour,
+      time.minute,
+    );
+    setState(() {
+      if (isStart) {
+        _startDate = selected;
+      } else {
+        _endDate = selected;
+      }
+    });
+  }
+
+  void _submitForm() {
+    if (!_formKey.currentState!.validate()) return;
+
+    if (_startDate == null || _endDate == null) {
+      _showAlert('請選擇開始與結束時間');
+      return;
+    }
+
+    if (_endDate!.isBefore(_startDate!)) {
+      _showAlert('結束時間必須晚於開始時間！');
+      return;
+    }
+
+    final formatter = DateFormat('yyyy-MM-dd HH:mm');
+    final message =
+        StringBuffer()
+          ..writeln('活動申請已送出')
+          ..writeln('名稱：${_titleController.text}')
+          ..writeln('開始時間：${formatter.format(_startDate!)}')
+          ..writeln('結束時間：${formatter.format(_endDate!)}')
+          ..writeln('地點：${_locationController.text}')
+          ..writeln('描述：${_descriptionController.text}')
+          ..writeln('需報名統計：$_needRegister');
+
+    if (_repeatOption != 'none') {
+      final map = {'weekly': '每週', 'biweekly': '每兩週', 'monthly': '每月'};
+      message.writeln('重複設定：${map[_repeatOption]}，共重複 $_repeatCount 次');
+    }
+
+    if (_poster != null) {
+      message.writeln('檔案名稱：${_poster!.path.split('/').last}');
+    }
+
+    _showAlert(message.toString());
+  }
+
+  void _showAlert(String text) {
+    // print('Submit button pressed'); // ← Debug 用
+    showDialog(
+      context: context,
+      builder:
+          (_) => AlertDialog(
+            title: const Text('訊息'),
+            content: Text(text),
+            actions: [
+              TextButton(
+                onPressed: () => Navigator.pop(context),
+                child: const Text('確定'),
+              ),
+            ],
+          ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('提交活動申請'),
+        backgroundColor: const Color(0xFF9eaf9f),
+        foregroundColor: Colors.white,
+      ),
+      body: SingleChildScrollView(
+        padding: const EdgeInsets.all(16),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            children: [
+              TextFormField(
+                controller: _titleController,
+                decoration: const InputDecoration(labelText: '活動名稱'),
+                validator: (value) => value!.isEmpty ? '必填' : null,
+              ),
+              const SizedBox(height: 12),
+              _buildDateField('開始時間', _startDate, () => _selectDateTime(true)),
+              const SizedBox(height: 12),
+              _buildDateField('結束時間', _endDate, () => _selectDateTime(false)),
+              const SizedBox(height: 12),
+              TextFormField(
+                controller: _locationController,
+                decoration: const InputDecoration(labelText: '地點'),
+                validator: (value) => value!.isEmpty ? '必填' : null,
+              ),
+              const SizedBox(height: 12),
+              TextFormField(
+                controller: _descriptionController,
+                decoration: const InputDecoration(labelText: '活動描述'),
+                maxLines: 4,
+                validator: (value) => value!.isEmpty ? '必填' : null,
+              ),
+              const SizedBox(height: 12),
+              DropdownButtonFormField<String>(
+                value: _needRegister,
+                decoration: const InputDecoration(labelText: '是否需統計報名人數？'),
+                items:
+                    ['否', '是']
+                        .map((v) => DropdownMenuItem(value: v, child: Text(v)))
+                        .toList(),
+                onChanged: (v) => setState(() => _needRegister = v!),
+              ),
+              const SizedBox(height: 12),
+              DropdownButtonFormField<String>(
+                value: _repeatOption,
+                decoration: const InputDecoration(labelText: '是否重複舉辦'),
+                items: const [
+                  DropdownMenuItem(value: 'none', child: Text('否')),
+                  DropdownMenuItem(value: 'weekly', child: Text('每週一次')),
+                  DropdownMenuItem(value: 'biweekly', child: Text('每兩週一次')),
+                  DropdownMenuItem(value: 'monthly', child: Text('每月一次')),
+                ],
+                onChanged: (v) => setState(() => _repeatOption = v!),
+              ),
+              if (_repeatOption != 'none') ...[
+                const SizedBox(height: 12),
+                TextFormField(
+                  decoration: const InputDecoration(labelText: '重複次數（不含首次）'),
+                  keyboardType: TextInputType.number,
+                  initialValue: '1',
+                  onChanged:
+                      (v) =>
+                          _repeatCount =
+                              int.tryParse(v) != null ? int.parse(v) : 1,
+                ),
+              ],
+              const SizedBox(height: 24),
+              ElevatedButton.icon(
+                onPressed: () {
+                  // 檔案選取功能：日後可整合 `file_picker` 套件
+                  _showAlert('尚未實作檔案選擇功能，請整合 file_picker 或 image_picker');
+                },
+                icon: const Icon(Icons.upload_file),
+                label: const Text('上傳活動海報'),
+              ),
+              const SizedBox(height: 24),
+              ElevatedButton(
+                onPressed: _submitForm,
+                style: ElevatedButton.styleFrom(
+                  backgroundColor: Colors.green,
+                  padding: const EdgeInsets.symmetric(
+                    vertical: 12,
+                    horizontal: 32,
+                  ),
+                ),
+                child: const Text(
+                  '送出申請',
+                  style: TextStyle(color: Colors.white),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildDateField(String label, DateTime? value, VoidCallback onTap) {
+    final formatter = DateFormat('yyyy-MM-dd HH:mm');
+    return Row(
+      children: [
+        Expanded(
+          child: Text(
+            '$label：${value != null ? formatter.format(value) : '未選擇'}',
+          ),
+        ),
+        TextButton(onPressed: onTap, child: const Text('選擇')),
+      ],
+    );
+  }
+}