The invention relates to the technical field of network inertia allocation mechanisms and analysis methods, in particular to a network inertia allocation mechanism and characteristic analysis method based on VSC active support. According to the method, the disturbance resistance of the system is improved by selecting a system inertia center point and utilizing the deviation of the inertia center point, and a power system inertia center position selection principle is included; the inertia center point of the network deviates to the network disturbance point; and the new inertia is added to thenetwork weak inertia area. According to the invention, the anti-disturbance capability of the new energy-containing power grid can be improved. As the inertia is adjustable when the VSC adopts an active support control strategy, the inertia center of the network is adjusted according to the detected disturbance point position of the network, and the disturbance resistance of the network is promoted. The consumption of new energy can be promoted. The VSC adopting the active support control strategy is added, the stability of the network is improved, more new energy is consumed by the network,the output power of the added VSC can also be provided by the new energy, and the consumption is further promoted.