In order to improve the static voltage stability of distribution network, a scheme of distributed generation access optimization is proposed. The conclusions obtained from the test system may be available for multiple-DGs connected to distribution networks. Based on IEEE 33 bus distribution network and MATLAB simulation test software platform, this paper takes the static voltage stability index L and maximum voltage deviation minimum as the objective function, considers the maximum voltage deviation less than 7 percent as the constraint condition, and applies adaptive particle swarm optimization algorithm (adaptive mutation particle swarm optimization algorithm, AMPSO) to optimize the layout of DG in distribution network access, thereby improving the static voltage stability of the entire distribution network. And through the actual distribution network in a certain area of Chongqing for example, the correctness and feasibility of the scheme is proved. The proposed scheme has certain guiding significance to the improvement of the static voltage stability of distribution network.