In the Criminal Procedure,the relationship between the defend attorney and client has always been a difficult problem.Sometimes, for a lawyer the client's proposal seems to be unreasonable or illogical.Should they follow the cilent's ideas to process the lawsuit or just believe themselves to select the right way? Actually there are two different opinions on this problem,one is called the "completely entrust model" and the other is called "appeal agent model".Here the author compares the role of the criminal defense lawyer made by ABA and JAA,and explains the original opinion of the previous problem.