If a foreigner has a permanent residence permit in China, but wants to return to China, should he hold a China passport or what documents should he hold?

If a foreigner holds a foreigner's permanent residence permit in China, then the foreigner holds a foreign passport. Foreigners holding valid foreign passports and valid permanent residence permits for foreigners can freely enter and leave Chinese mainland within the validity period of the documents without applying for a Chinese visa. If a foreigner holds a China passport, it means that he has China nationality and is from China, not a foreigner. If a foreigner holds a foreign passport and a China passport at the same time, it is often China people born in China who emigrate. He concealed the fact that he joined a foreign nationality, and kept his China passport, resulting in de facto dual nationality. The Government of China does not recognize dual nationality. Mixing two passports often leads to problems.