Abstract: Objective To explore the high-risk fault risk of CT simulator and the main causes of the risk, and to put forward effective risk management strategies. Methods The failure mode and effect analysis method was used to identify and control the operational fault risk of CT simulator. Results 5 major fault components, 8 fault failure models and 17 failure causes were analyzed. The top 5 failure causes are:anode target surface burn caused by direct scanning without warming up the tube (590.4), tube failure (518.2), burnout of joints caused by aging of high voltage cables (424.2), motor carbon brush wear (304.8) and belt break (296.4). Conclusion The failure mode and effect analysis method can effectively identify the risk of equipment failure, and thus specifically formulate risk management and control measures to ensure the normal operation of equipment and the safety of doctors and patients.