Abstract: According to the Ministry of Transport regulation requirements for double prevention mechanism construction of risk classification control and potential accident detection and rectification in urban rail transit operation safety, the key points and procedures of constructing the double prevention mechanism fitting Suzhou Rail Transit operation features is introduced. From the practical problems in the double prevention mechanism construction, key points and measures that requires attention of operation unit constructing double prevention mechanism are proposed. Specific suggestions for improving onsite application performance of the mechanism are proposed.