Abstract With rapid development of social economy, dependence of every industry on electric power is stronger and stronger. Meanwhile, the height of ground construction rises unceasingly and low topography is filled, which has brought hidden trouble for security of part of the ultrahigh voltage transmission line. So the enhancement of these charged transmission lines become inevitable. This paper introduced the design thought of enhancement technology of ultrahigh voltage transmission line and the structure and function of the elevating frame was presented. Finally the stability of the elevating frame was checked．
