Abstract: The benefit evaluation for low voltage distribution network area mainly considers economic benefit and ignores the voltage quality problems, which results in the problem that the initial investment is only considered in reactive power compensation schemes. So in this paper, a comprehensive benefit method of reactive compensation for low voltage distribution network area is presented from two aspects of voltage quality and economic benefit. Firstly, index system for voltage quality is established and each index is described and defined. At the same time,the operation cost of reactive power compensation device and the saved network-loss cost are evaluated separately, which take net income as economic benefit index. Then, different compensation schemes are designed from two aspects of the reactive power compensation capacity and compensation site, and their comprehensive benefit are compared. In the end, examples are analyzed by using proposed indexes, and the results show the method can directly evaluate the advantages and disadvantages of comprehensive benefits for reactive compensation schemes.