Aiming at the problem of how to plan the allocation of distributed generation (DG) in the process of distribution network construction so that the grid company and users can obtain considerable benefits, the paper proposes a cooperative optimization model between the grid company and users that takes into account the influence of seasonal factors. Firstly, the overall framework of DG construction plan is constructed by considering the interaction between distribution network construction and operation; secondly, the distribution network planning model under the constraint of reliable operation is constructed by taking the economy of new distribution lines as the target and taking into account the cost of carbon tax; and then, the user benefit model is constructed by considering the allocation of DG and the adjustment of power consumption strategy during operation, and the co-optimization model is proposed based on the genetic algorithm to solve the problem. Then, a user benefit model considering the allocation of DG and the adjustment of power consumption strategy during operation is constructed, and a co-optimization model is proposed based on genetic algorithm to maximize the overall benefit; finally, the feasibility of the co-optimization model is verified based on IEEE33 node network, and the results show that the proposed distribution network benefit optimization model under clean energy access taking into account the seasonal factors can effectively improve the operational benefit on the basis of improving the overall performance.