Abstract: A bridge aging pedestal electricity control system with PLC control was designed in the paper. The principle and characteristics of the system were also introduced in detail. Some functions such as procedure control, sampling analysis, data process, self-detect and alarming were carried out with the control system,and furthermore,the control system realized the man-machine dialogue through touch screen. The direct current parameter could be adjusted for the required AC voltage parameter of bridge aging pedestal,automatically controlling the high precision for inverted bridge aging pedestal.