Analyse of Criminal policy and Penalty's structure

Concepts of criminal policy are different,but the center goal of criminal policy is always defending cimie.The study of criminal policy is lasting, because it must inquire into the change of criminal policy in different time; It is important that criminal policy adjusts the structure of penalty ; The change of criminal policy effects the change the structure of penalty directly , and there are different structure of penalty in different time ; It is inexorable trend of history that penalty's relaxation is realized.