At present,network configuration of transformer substation automation abroad widely adopts Ethernet,security matter of Ethernet’s opening arose people′s keen attention. Security of remote control across network become even more important. To enhance the security of remote control, there is a good method on remoting control message encryption except for regulating operation flow and enhancing protective wall. This paper brings forward a sort of remote control realization based on token.It adopts ameliorative RSA-1 publicity secret key arithmetic and combines method of encrypting on every operations. The measurement-control device brings up token, the operator calculates encrypted database and feedback measurement-control device to detecting the legitimacy of operator. In this way, legal operator can process normal remote control, and can effectively avoid any illegal remote control of any illegal operator.