The existing single consistency evaluation method of substation reliability has shortcomings in substation state monitoring and maintenance decision. Based on analyzing the characteristics of intelligent substation and its information flow, this paper establishes a reliability evaluation model of information flow based on information flow dynamics, which reflects the reliability of intelligent substation network from two aspects of information flow transmission delay and data loss rate.Through simulation, the reliability of the four operating modes of intelligent substation network information flow, including steady state, limit flow, specific scene and abnormal network flow, is evaluated. The results show that this method can evaluate the reliability of information flow in intelligent substation network to some extent.It provides reference and reference for the development of reliability assessment of intelligent substation network information flow.