On the whole, the movement of law and economics shows numerous schools and miscellaneous thoughts. It is obviously not a movement with identical standpoint and pace , but a research process with the coexistence of different academic traditions, of which some studies are complementary, and some are competitive even oppositional. By studying of the 50 years theoretical history of law and economics, it is of great significance to analyze, interpret and explain the seven existed law and economics theory genres based on different academic traditions and perspectives.