In view of the difficulty in building and low stability of the substation equipment maintenance anti-fall support on complex terrain, a three-dimensional configuration model of the safe position of the substation equipment maintenance anti-fall support is designed. Build a three-dimensional configuration model of the safe position, use the direct integration method to verify the parameter stability, ensure that the support maintains the same plane on the sloping terrain, and take into account the height change and avoid the shadow between the equipment, and obtain the safe position with the best stability coefficient to support the support. The result of the example analysis shows that the stability coefficient of the model has been improved to a certain extent under different orders.