With the increasing penetration rate of new energy, the application of power electronic devices such as inverters is becoming more and more common. Therefore, it is particularly important to limit overcurrent during faults in the low-voltage ride through process of power electronic devices. Virtual impedance is one of the common methods to limit overcurrent based on the grid forming VSG control method, which can effectively limit fault current, protect the safety of the inverter, and adjust the impedance ratio to spontaneously inject specified reactive current. This article proposes a dynamic transition virtual impedance method to address the problem of difficult suppression of surge currents encountered during low voltage ride through of grid forming inverters. This method improves the conventional method of directly switching virtual impedance by gradually transitioning the virtual impedance value into a first-order function, thereby avoiding new impact problems caused by direct switching of virtual impedance, and briefly analyzes its mechanism of action. Finally, the feasibility of the proposed scheme was verified through Matlab simulation.