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Supervisory Control and Data Acquisition (SCADA) systems are critically important to the procedure of modernimtion of contemporary power systems, industries etc. A SCADA system involves the integrated technologies of computer, communication, electric devices etc. Electric utilities are expected to choose the communication media best suited for the characteristics of distribution facilities. The communications systems provide the physical medium for transferring, controll ing and acquisition of data within SCADA from remote locations. Currently, it is generally recognized that wired communications will serve as the best solution to this problem. Obviously, compared with wired communications, wireless communication presents a number of security and reliability concerns for SCADA system but wireless communications become an attractive option as communication network. In SCAD A system the communication system plays a key role and to meet objective of the SCADA system, as a result, various communication media have been applied. In our paper we present a concept about SCADA system using IEEE 802.22 standard where details design of system, analyses of feasibility and benefits over wired andother wireless systems and scopes to enhance the performance are also described. If we apply this system in a large industrial distributed system and in a total railway system, then the total designs are also shown in our paper.