The access of a high-penetration of renewable energy to the distribution grid has facilitated the participation of a DG in peer-to-peer (P2P) market transactions. However, it also poses a challenge to the safe and stable operation of the grid. To solve the congestion problem caused by P2P transactions under the continuous double auction (CDA) mechanism, a congestion management approach and mechanism is proposed. It considers the economics of prosumers and the coordination between the P2P energy market and the congestion service market. To realize the reasonable responsibility of prosumers, a congestion model is proposed that considers the timing of transactions. In addition, the bidding model of flexible resources for congestion services considering the economics of prosumers is described. It ensures that the economic benefits of the prosumers participating in the P2P energy market and congestion service market are not lost. Based on the above, a congestion management model considering network reconfiguration and flexible resource P2P transactions regulation is developed. Finally, the security calibration results and congestion management results are analyzed through concrete examples, and the feasibility and superiority of the proposed congestion approach are verified.