Legal basis: Article 25 of the Patent Law of People's Republic of China (PRC) does not grant a patent right for the following matters: (1) Scientific discovery; Scientific discovery is only an understanding of natural laws, not an invention made by using natural laws. Can not be directly applied to production practice, does not have industrial practicability, so no patent right is granted. (2) rules and methods of intellectual activities; It only guides people to think, identify, judge and remember the information expressed, and it does not use technical means, nor follows the laws of nature, and does not have the characteristics of technology, so it cannot be granted a patent right. (3) Methods of diagnosis and treatment of diseases; The diagnosis and treatment of diseases refers to the process of identifying, determining or eliminating the causes or pathological changes of living people or animals. It can't be used in industry, it's not practical, and it doesn't belong to the invention in the sense of patent law, so it can't be patented. (4) Species of animals and plants; Animal and plant varieties refer to the animal and plant varieties themselves, excluding the methods of producing them. If the intervention of artificial technology plays a major control or decisive role in the purpose or effect of this method, then this method does not belong to the main biological method and can be granted a patent right. (5) substances obtained by nuclear transformation; Because the substances obtained from nuclear transformation can be used for military purposes, the patent law stipulates that patent rights shall not be granted for the vital interests of the country. It should be pointed out that not only the substance obtained by nuclear transformation method can not obtain patent protection, but also the nuclear transformation method itself can not obtain patent protection. (six) the design of the pattern, color or the combination of the two. The production method of the products listed in Item (4) of the preceding paragraph may be granted a patent right in accordance with the provisions of this Law. The patent law stipulates that an invention can be patented as long as it has the necessary conditions for obtaining a patent. According to the characteristics of patent protection and China's economy, China's patent law has made exceptions for some topics that cannot be patented.