Abstract: Legal precedent,namely"precedent on the judgement",and it is sources of law of legal precedent.Legal precedent system and legal precedent law of China have essential difference,it have following several function of,namely the origin of the law,growing point of the law,explain,prove the law of making,remedy and make the deficiency of France,solve the present and judicial and standard disunion,realize the important means of the justice,help judge applicable law correct,restrain freedom right of cutting out et...