Abstract: The safety risk monitoring indicator system for civil aviation maintenance system was developed based on the influencing factors analysis on historical event data related to aircraft maintenance and the expert's opinions,which includes 20 risk factors selected from four aspects such as man(human factors),machine(equipment and facilities),medium(or environment)and organizational management.The evaluation method and standard of each indicator was provided by quantitative or qualitative approach.According to the characteristics of the safety risk monitoring indicator system,the fuzzy comprehensive evaluation model for civil aviation maintenance system Was developed.The application of this model shows that the indicator system and the model can not only make a convenient sgety risk assessment and early warning for civil aviation maintenance system,but also can find out the major risk factors and provide basis for the making of risk management measures.