For the existing power grid voltage management of voltage qualification rate index system has the phenomenon of artificially high and extensive, this paper puts forward a kind of index system and evaluation method based on voltage management business: on the basis of the original voltage qualified rate of the primary index, using the method of utility function of the existing four types of monitoring stations are its corresponding indicators at a lower level, synthetic model and calculation method. Verified through case analysis, the index system of the basic can comprehensively and objectively evaluate and reflect the voltage quality management to carry out the situation, in order to further improve the level of voltage quality management work provides effective basis.