In the condition of the B/S mode, the authentication server is difficult implemented by a client. This paper puts forward to use.NET Remoting program to verify the authenticity of Web site and reaches storage safety of authentification message by useing neural network weight and also realizes mutual authentication between the client and the server, every time the authentication produce different session keys so on. Safety analysis shows that the proposed scheme can effectively prevent fishing websites against common attack, increase the system security. The scheme is achieved by using ASP.NET, It proved to be feasible.