The prevailing electricity information network is a service network based on IP technology while incapable of satisfying the end-to-end quality of service（QoS） requirements of different applications. In order to meet different QoS requirements of various applications and provide them with end-to-end QoS， a new QoS mechanism of electricity information network based on the virtual circuit between ports（VCBP） is proposed. The working principle of VCBP and the resource management method are given. A new congestion avoidance algorithm is proposed and the QoS routing architecture is designed. In this QoS mechanism， the socket is directly bound with the VCBP sign. Unlike the conventional virtual circuit， VCBP can support both the resource sub-network and socket mechanism to satisfy different QoS requirements of different applications.