Do I need to bring my passport to Sanya?

You don't need a passport and visa to go to Sanya, which belongs to the inland area of China and an ordinary provincial administrative region, and you don't need a passport and visa for cross-provincial communication. China's Law on Exit and Entry Administration stipulates that China citizens shall apply for passports or other travel documents when leaving or entering the country.

Legal objectivity:

Article 9 of the Law of People's Republic of China (PRC) on Exit and Entry Administration, China citizens shall apply for passports or other travel documents when leaving or entering the country. China citizens who want to go to other countries or regions also need to obtain visas or other entry permits. However, unless the China government has signed visa exemption agreements with other governments or the Ministry of Public Security and the Ministry of Foreign Affairs provide otherwise. China citizens who leave or enter the country as seafarers and work on foreign ships shall apply for a seaman's certificate according to law.