Abstract: To ensure rationality of voltage source converter station layout and operational safety, reasonable air clearance is needed as design basis. G parameter method is adopted to calculate the minimum air clearance, and atmospheric correction is discussed when altitude is below 2 000 m. +160 kV converter station for large-scale wind plant integrated with power system based on VSC technology demonstration project is used as an example to analyze air clearance calculating method using g parameter method. The harshest operating condition is calculated by simulation as input of atmospheric correction, and actual air clearance for design is determined.