What documents do Xi 'an need to apply for direct flights to Taiwan Province Province? What documents do I need to apply for when transferring from Hong Kong?

You can't fly directly to Taiwan Province Province unless you are traveling with a group. If you want to travel freely, you have no choice but to apply for a business visa in Taiwan Province Province and fly to Taiwan Province Province via Hongkong!

The correct procedure is to need Hong Kong and Macao passes, passports and business entry permits!

In fact, what you understand is that you went to Hong Kong with your passport, and then your passport has a visa for a third place (such as Thailand) and a passport visa from Shenzhen to Hong Kong. In this case, no pass is needed! I suppose that's what you mean?

Yes, but it's not very safe, so follow the Hong Kong and Macao Pass, passport and entry permit. I hope I can help you! If you still don't understand, you can download "Hong Kong Tour to Cai Zhiwei" from Baidu!