Abstract: With the rapid development of power grid, in order to effectively solve the contradiction between production tasks and personnel, equipment and other resources, in the whole process of maintenance work, based on the analysis of the safety bearing capacity of on-site operations, the quantitative management mode of safety supervision was innovated, the safety work gateway was moved forward, the standardization of safety management was promoted, and the transformation from safety supervision to safety management was innovatively realized, and the field operation can be controlled, controlled and under control based on the "fourcolors" management of the field operation carrying capacity analysis.