Abstract: With the increasing penetration of distributed energy resources (DERs) in a distribution system, it seems particularly important how to realize the local utilization of DERs. Besides, with the increase of the number of prosumers, the intra-region and inter-region energy sharing becomes an effective way to make full use of the demand-side resources. Considering the inadequacy of the existing multi-region sharing mechanisms and the complex behaviors of the prosumers in the multi-region energy sharing, this paper proposes a multi-region peer-to-peer (P2P) energy sharing mechanism based on a two-stage evolutionary game model. First, we divide the distribution system into multiple regions based on the Newman fast method and propose an improved regional price mechanism based on the supply-demand ratio. Then, on the basis of the buyers' and sellers' evolutionary game model, a multi-regional P2P energy sharing mechanism is established to realize the energy sharing among the prosumers in the multiple regions. The distribution system operator (DSO) manage the energy sharing to balance better the supply and demand in the multiple regions through the price regulation signals that include the cross-region transaction fees and the equivalent regional prices. Finally, the case study is carried out in the IEEE 33-bus system, verifying the effectiveness of the proposed mechanism.