Compared to the pettiness of one's crime,innocence defense is more important for that it is directly related to whether the suspect or the defendant's conduct would constitute a crime,or their life and liberty rights be deprived of in an individual case.On the other hand,innocence defense is also related to the establishment of the lawyers' image of "protect rights"groups and the lawyer system,and whether the major policies of the rule of law win the trust from people.Our law have authorized a defender the right of innocence defense for the defendant,however,owning to various reasons,the concept of "pleaded to not guilty is hard in practice"has long been a consensus in the legal profession and academia.