Bail pending trial is a compulsory measure stipulated in China's criminal procedure law. It refers to a compulsory measure that the public security organs, people's procuratorates, people's courts and other judicial organs order criminal suspects and defendants who are not arrested or need to change compulsory measures after arrest to put forward a guarantor or pay a deposit, and issue a letter of guarantee to ensure that they can be used at any time to prevent them from evading investigation, prosecution and trial, and not to detain them or temporarily release them.