The patent system aims to protect technology to enjoy exclusive and exclusive rights. Any party other than the right holder who uses a patent must obtain the right to use it through the authorization of the patentee. With the continuous improvement of the legal system, the use of patents has shown a diversified trend, and patent invalidation, patent revocation, expired patents, etc. have been included in the scope of patent law. Only by fully understanding such legal systems can we make full use of patent resources and realize more economic value for enterprises.