2012 Criminal Procedure Law created the new procedure of Compulsory medical care on suspects with mental illness, which aims to coordinate with Article 18 of Criminal Law and solve practical problem of Wufengzi(suspects with mental illness threatening public safety). The 2012 law is so general that we need interpret key issues of the new procedure in order to implement the law, for example definition of character, target, temporary compulsory measure, time limit and jurisdiction and implementation facilities.