The fact that contemporary Chinese law is in "reasonable illegal" dilemma origins the deconstruction of the modern legal change on the unified model of ancient legal "Situation-Reason-Law", in order to graft the Western legal and cultural achievements of Chinese legal blueprint. Thus, the reference solution in the Western experience "reasonable illegal" method is necessary. Italian scholar Alexander Passerin d'Entreyes uses natural law to solve the issue of legal positivism, for example, to explore the experience of the Western natural law of the current Chinese legal significance.