The invention discloses a method and a system of peer-to-peer network node degradation and a peer-to-peer network node. The method of peer-to-peer network node degradation includes the steps: a to-be-degraded peer-to-peer node in the peer-to-peer network sending exit requirement information to a subsequent node; when exit agreement information which is sent by the subsequent node is received, the to-be-degraded peer-to-peer node being degraded to a customer node, wherein the exit agreement information is sent after the subsequent judging a service which can handle the to-be-degraded peer-to-peer node according to the present handling ability. The method and the system of peer-to-peer network node degradation and the peer-to-peer network node solve the problem that the peer-to-peer node of the existing peer-to-peer network is directly degraded to the customer node so that the subsequent node is overloaded in the prior art.