With the rapid economic and social development in rural areas, the shortage problem of power supply has been highlighted in some areas and the low voltage phenomenon in distribution network region is serious. In view of the current issues that low voltage control measures are lacking of systematic and targeted, this paper proposes an optimized evaluation method of low voltage control measures in distribution network region based on improved TOPSIS. Firstly, the voltage evaluation index system of distribution network region is constructed, and the improvement effect of the voltage is evaluated by the voltage index improvement rate. Based on the traditional TOPSIS method, the experts’ experience is quantified into the corresponding eigenvector by using AHP, which is then introduced into the positive and negative ideal solutions of target decision matrix. By calculating the distance and relative closeness between schemes and positive or negative ideal solutions, the voltage improvement effect can be judged. The results show that the method proposed in this paper is effective by analyzing a distribution network region with low voltage problems.