Abstract: The organization structure must change to make the organization adapt to the dynamic, autonomy multi-agent system (MAS) environment.Through adding an additional layer in the original MAS, we build a two-level assisted MAS model.The new added layer is in charge of organization adaptation.In order to help the organization, the paper gives the correlation function of organization adaptation.Through the simulation in a peer-to-peer network, it is proved that the proposed model in which an additional layer is added in the original system has better adaptation performance.