Between the 12th and 13th century,a series of significant and even revolutionary changes had taken place in British legal institution,enboding the centralization of the judicial system,the uniformity of the legal system,the specialization of the trial institutions,the rationalization of trial ways and the professionalism of judical personels.In consequence,a set of country\|wide legal systems and judicial institutions were established which was the first national law system in European history.From its appearance,some basic features of mordern legal system had shown clearly.It was the “prematurity” of the legal institution that separated Britain from other European countries and advanced following its own way.At the same time,with the common law growing up gradually and getting into perfection,it had deeply immersed into the Britain society and its national culture.