The gap structure composed of workers, conductors and different towers under the equipotential condition of live working is quite different from the typical long air gap structure. At present, there are few key parameters of corona discharge in live working gap at different altitudes, which leads to the unclear influence mechanism of meteorological factors on the physical process of corona discharge in live working gap. Therefore, this paper builds a corona inception model considering the photoionization process, and studies the corona inception characteristics of charged workers with different attitudes at different altitudes. The simulation results show that when the live workers work facing the tower window and back to the tower window, the most prone to corona initial is the foot and back respectively. The study found that when carrying out live working, the back and feet of the staff are more prone to corona inception. And as the altitude increases, the corona initial voltage is lower.