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Aiming at the problem that the location and capacity of distributed generation(DG) will have a great impact on power flow distribution of distribution network, a new method of location and capacity optimization of DG access to distribution network is proposed. A planning scheme with distribution network revenue, node voltage deviation and microgrid permeability as objective functions is established. Particle swarm optimization (PSO) algorithm is adopted, that is, the simplex method is used to initialize the PSO algorithm; a control factor is introduced to dynamically adjust the inertia weight to improve the convergence ability of the algorithm; and mutation factor is introduced to enable the algorithm to effectively jump out of the local optimum to find the global optimum solution in the later stage of convergence. An example shows that this method can effectively reduce the network loss and voltage deviation when DG is connected into the distribution network.