According to the Patent Law of People's Republic of China (PRC), if you want to apply for a patent for an invention or creation made in China, you should first apply for a patent in China. When applying for a patent abroad, you need to entrust an agency with the qualification of foreign-related patent agency to handle the relevant procedures.
The patent application system in Hongkong is different from that in China. To apply for a patent in Hong Kong, you need to entrust an agency with foreign agency qualification and ability to apply for a patent.