This paper discusses the various methods of exchanging thoughts, views, or ideas among people, and the process of communication which be applied by system analyst in a project of system development.

With the development of power system and the complexity of system structure, transmission network is more important in the whole system, so people pay more attention to reliability of power system.

The rational decision at the lowest cost in inviting to bid for a project, as a way and a system which is accepted by most people, will be put into practice for further development.