Abstract: This paper presents a concept of storage reliability of equipment on duty at ground, and puts forward a classi-cal statistical evaluation method and a Bayesian evaluation method according to ground environment of equipment which is on duty and existing data type. Corresponding evaluation procedures of storage reliability are proposed, and storage reliability of equipment on duty at ground is evaluated with the above two methods, respectively, based on the test data to obtain its variation tendency. The present storage reliability of equipment on duty at ground may be taken as one of the quantitative parameters for usage reliability evaluation of equipment, and may provide a reference for im-proving storage reliability of equipment.