https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/china/general-information-about-2

What inventions cannot be patented in China?

According to Articles 5 and 25 of the Chinese Patent Law, the following items are not patentable in China:

  • any invention-creation that is contrary to the law or social morality or that is detrimental to public interest
  • invention-creations relying on genetic resources of which the acquisition or use is not consistent with the provisions of the laws and regulations
  • scientific discoveries
  • rules and methods for mental activities
  • methods for the diagnosis or treatment of diseases
  • animal and plant varieties
  • substances obtained by means of nuclear transformation
  • two-dimensional designs of images or colours or combinations of the two that mainly serve as indicators

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