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Based on the differential anti-galloping concept and Double Pendulum Anti-galloping Device, optimization analysis was carried out for the ordinary span and long span of 1000 kV Ultra-High-Voltage AC transmission project. Based on the full investigation of the design conditions of ordinary span and long span of the UHV AC line, and the stability mechanism, the influence of the theoretical pendulum length values of Double Pendulum Anti-galloping Device on the instability characteristics of iced conductor with different icing thickness and ambient wind speed were calculated and analyzed. The results showed that 900 mm should be taken as the theoretical pendulum length of the ordinary span, and 800 mm for the long span, which can obtain the best anti-galloping effect, which provides a reliable reference for the anti-galloping design of subsequent UHV transmission lines.