Li Zhuang case is a typical case of the crime crackdown in Chongqing. From the perspective of Constitutional Law， Li Zhuang case has the following revelation: in the crime crackdown process， procedural justice should be maintained to protect the basic rights of citizens and lawyers， and the public security organs should also hold a cautious attitude toward the joint handling of cases. To prevent extorting confessions by torture， perfecting the constitution is the premise， and establishing the constitutional interpreting mechanism is the key point. In addition， media freedom on the constitutional level is also of vital importance to protect the basic rights of criminal suspects.