In view of the fact that the static bay map is incapable of adapting to the future development of electric automation because of its maintenance difficulty and long delay response time of man-machine interface（MMI） operation， it is necessary for the electrical bay map in the big computer centralized SCADA system in the unmanned substations to be automatically generated without special parameters or file. Such key technologies for the automatic generation of the bay map as the bay map template and figure database auto association are analyzed at length. Two practical methods are presented for the automatic generation of the bay map， i.e. the method based on the keywords of real-time database and the method based on scalable vector graphics（SVG）.