The book "Chinese Law and Chinese Society" by Mr. Qu Tongzu introduced the "functional theory" research method in the field of sociology into the study of Chinese legal history, innovatively choosing five parts of Confucianism and Taoist thought, i.e., family, marriage, class, witchcraft and religion, to complete the study of Chinese traditional legal society. We call it "typology" in the study of Chinese law. On the one hand, this type of research abstracts the common problems in the

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... l Chinese society and law for the past two thousand years, so it has some reasonable and creative points; on the other hand, it also ignores some changing factors in the historical development.