Crime is a theory of cognitive crime and a tool system for evaluating crime. It is not an end in itself but serves the practice of criminal law, and its theoretical status should not be too low or too high. The structural differences between the three levels and four elements of the two criminal theory systems are mainly reflected in the two different methods of arranging and combining the elements of crimes, and there is not much essential difference. Theory and practice, in theory, there is also a theoretical system of admitting two kinds of crimes, which will not cause confusion in criminal judicial practice. Different criminal theory systems can coexist in practice, and it is not difficult to judge the qualities that China people should have at least.

[Keywords:] criminal theory system, three categories, four elements, coexistence