As long as the market economy being perfected the Chinese competition legislation becomes an important and an attractive event both in and out of the state. Especially a series of hotspots and debates come out during the process of drafting the Anti-monopoly Law. Is that the free enterprises system in the west world represented by the U.S. can be the modal replanting in Asia countries too? Is it possible for the countries which economy is dominated by government regulation can adopt the Anti-monopoly law which is named "Economic Constitution" in the west? Could the developing countries as China accept the competition system of the developed countries without changes?Japan has been considered as the representative nation which replanted legal system from foreign countries. In the past century the Japanese opened its door and introduced an enormous number of new laws of economic nature. The anti -monopoly law was one of the most important and disputable law. Through more than sixty years practice and development the Japan's Anti-monopoly Law has formed its own feature dramatically. From accepting the US anti-trust law to being in harmony with situation of homeland, the competition policy of Japan has played a great role in the development of economy. The process of construction of Japanese anti-monopoly law has contributed a very important experience of replanting the legal system from