According to the inquiry of China Travel Service. Com, "Xiaoyao Code" is a digital supervision code introduced by Hangzhou, which has the functions of accurate positioning, convenient recording, real-time supervision, safety and reliability. The police can control the suspects in an all-round, whole-process and all-factor way through "unrestrained code". In accordance with the "Criminal Procedure Law of People's Republic of China (PRC)", the compulsory measures shall be lifted, and the person who has been released on bail pending trial, the resident under surveillance and the relevant parties shall be notified in time.