According to the provisions of China's patent law, the term of the invention patent right is 20 years, and the term of the utility model patent right and the design patent right is 10 years, all of which are counted from the date of application. Before the TRIPS Agreement came into effect, most countries stipulated that the term of invention patent right was 15 years or 20 years. In the field of drugs and pesticides, applicants need to carry out a series of experiments, and after many procedures, they can get the approval of the competent authorities, and they can only be sold after passing the examination by the competent authorities. In addition, the research and development costs of many drugs, especially biological drugs, are quite high. If the patent term is 15 years, many patentees in these fields will not be able to recover their huge investment, and the result will inevitably affect their enthusiasm for invention and creation. In order to encourage the patentee's invention and creation, when China revised the Patent Law in 1992, the term of invention patent was extended from 15 to 20 years, and the term of utility model and design was extended from the original 8 years (including the extended 3 years) to 10 years. TRIPS agreement stipulates that the protection period of invention patent and design is not less than 20 years and 10 years respectively from the date of application.