legal ground
Article 5 of the Patent Law of People's Republic of China (PRC)
No patent right shall be granted for inventions and creations that violate laws, social morality or harm public interests.
No patent right shall be granted to inventions and creations obtained or utilized in violation of laws and administrative regulations and completed by relying on genetic resources.
Article 25
No patent right shall be granted for the following items:
(1) scientific discoveries;
(2) rules and methods of intellectual activities;
(3) Methods of diagnosis and treatment of diseases;
(six) the design of the pattern, color or the combination of the two.