The structure of rural power grid in China is relatively weak and lack of power supply ability leads to frequently various low voltage problem. In this paper

a kind of evaluation method of low voltage contribution degree based on improved grey relation analysis in distribution grid is proposed. The entropy weight theory is introduced to evaluate the grey relation coefficient based on traditional grey relation analysis

which can overcome the defect of expert weighting method and average weighting method. It is shown by the calculation result that the method proposed in this paper can accurately analyze the key point of the low voltage in distribution network and achieve accurate and effective control of the low voltage in the low voltage contribution degree in the distribution network.