Abstract: The paper discussed key problems of measurement of reliability indexes of safety monitoring and control system of coal mine such as determination of invalidation range, set of scale of test system, design of test stress and selection of test scheme, and proposed two measuring methods of reliability indexes of safety monitoring and control system of coal mine named direct measuring method and indirect measuring method. Through comparison of the two methods' advantages and disadvantages, the conclusion was gotten that the indirect measuring method is more suitable for measurement of reliability indexes of safety monitoring and control system of coal mine.