Abstract: In view of the problems in the process of anti misunlocking of substations at present, a new anti misunlocking key management system is designed according to the current mode of substation unlocking key management.The system is composed of on-site anti misunlock key management cabinet and remote background.It realizes the on-site locking of the key, the random generation of the unlocking password and the control of the anti misunlocking approver.Make on-site unlocking under approval and supervision.Realize the controllability of on-site unlocking.Improve the safety of substation on-site operation.