Abstract: In order to reduce the operation risks brought by carbody cracks on urban rail transit train, to improve the train operation risk management and control scheme, the occurrence of urban rail transit operation accidents caused by carbody cracks must be eleminated. Since the discovery of carbody cracks on the first train of Shanghai urban rail transit in 2015, based on the on-site inspection and repair of the discovered carbody cracks, the number and form of the carbody cracks are sorted. Based on LS (risk matrix)-FAHP (fuzzy analytic hierarchy process) model, safety risk assessment is conducted on trains with carbody cracks and the crack formation causes and control measures are analyzed. A complete management and control strategy is developed based on risk factors, and detailed repair, acceptance and review mechanisms are determined. In terms of aspects such as exceptional release, follow-up tracking, new vehicle procurement, and supervision of train manufacturing, requirements are proposed correspondingly to carbody crack length of exceptional release, crack expansion inspection, tracking maintenance frequency, non-destructive crack detection. Through practical application on multiple lines and corresponding inspection results, it has been verified that the carbody crack management and control strategy not only effectively meets the basic transportation capacity of urban rail transit main lines, but also ensures the safe operation of the train. Results show that the above strategy based on safety risk assessment can effectively improve the ability of maintenance personnel to detect and handle vehicle crack faults, further ensuring the train operation safety on urban rail transit lines and the service level of main line.