The distributed generation (DG) connected to power distribution network affects economic benefits of the distribution network operators (DNOs), DG investors and customers. Firstly, based on the analysis of DG’s influence on distribution of voltage, line losses as well as the reliability of nodes, this paper concludes the candidate locations of DG by calculating the index reflecting the influence degree of each node’s load on the system losses, i.e. the secondary precise moment and the index that can indicate the bus voltage stability, combined with the user's reliability requirements. Then, multi-objective optimization function is established based on maximum unit yearly benefits of the DG independent investors and the maximum benefits obtained by DG integrating into the improved grid. In solving this model, this paper uses the improved non-inferiority genetic algorithm and segmented chromosome manipulation to achieve the optimization of DG types, location and access capacity simultaneously. The algorithm results is selected further by using coordination function to make the final result obtained more scientific and reasonable. At last, the simulation is conducted on the 69-bus distribution system. The result validates the constructed models and the proposed methods about coordinated plan.