Due to the multi-agent problem in the investment construction of a newly added distribution network and the unclear cooperation mode between the agents, the paper studies the cooperation mode between the incremental distribution network and the power supply company. Firstly, the paper constructs an evaluation index system based on saliency-redundancy analysis. Then, in order to ensure the weighting accuracy, an objective weighting method and a subjective method are utilized to construct an index weighting model based on the analytic hierarchy process method modified by the entropy weighting method. After that, on the basis of the changing speed state model and the changing speed trend prediction model, a dynamic dynamic-comprehensive fuzzy evaluation model for the Cooperation Mode of the incremental distribution network is constructed. Finally, four scenarios are set up:absolute control of power supply company, relative control of power supply company, the shareholding of power supply company, and non-shareholding of power supply company to perform example analysis. The calculation examples show that the dynamic-comprehensive evaluation model can reflect the actual level of effectiveness better than the static evaluation model.