Abstract: The American law is a unique and well- developed legal system,which is developed on the basis of inheriting and transforming English law.For almost four hundred years,the developing history of American legal culture goes through the period of accepting the influence from foreign countries,the period of self-development,the period of perfecting and being transplanted to foreign countries.Compared with the legal culture of other western countries,American legal culture has its own distinct traits,which are mainly:strong constitutional culture,gradual rising passion of loving lawsuit,reactive mobilization procedure,various kinds of numerous and jumbled legal systems,and besides which,the judges,especially the ones in Federal Supreme Court of the United States,who thoroughly destroyed the feudal legal system,play an important role in the law development of America.

Key words: American, legal culture, trait