Abstract: Virtual power plant (VPP) is an effective means to solve the grid connected fluctuation of distributed energy. The effective identification of the VPP key lines is conducive to preventing the VPP system failures and improving the operation safety and stability. Aiming at the problems that there are few researches on the VPP route evaluation and usually just a single index to use, a VPP critical route evaluation model considering the static network flow is proposed. Firstly, based on the complex network theory, the VPP multi-layer network model with data acquisition equipment as the main node is constructed. Secondly, according to the different business characteristics of the VPP operation control system and the power network, the evaluation index system of the VPP critical line based on the information flow and energy flow is established. Finally, the optimal weighting method is used to allocate the index weights to fuse the key indexes. The simulation results show that the critical path identified by the proposed evaluation model has a significant impact on the network energy propagation and the topology structure, which verifies the feasibility of the proposed critical path evaluation mechanism and effectively quantifies the VPP evaluation strategy.