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Law is the science of law. It is a science that studies laws, legal phenomena and their regularity. As a mandatory norm of society, the direct purpose of law is to maintain social order and realize social justice through the construction and maintenance of order. Jurisprudence as the research object of law, its core lies in the study of order and justice, that is, the study of order and justice. In China, legal thought originated from legalist philosophy in the Spring and Autumn Period and the Warring States Period. In the pre-Qin period in China, law was called "the study of criminal names", and since the Han Dynasty, it was named "the study of law". In the west, the ancient Roman jurist Ulpia Pianu defined the word "law" as: the concept of affairs between man and God, the study of justice and injustice. By 2020, there will be 52 institutions with the right to award first-class doctor of law degrees in Chinese mainland, which is an educational highland for training legal talents in China.