Abstract: The effect of atmospheric intra-seasonal low-frequency oscillation (30-50 day) during the period from May to October,1980 on tropical cyclone tracks are analysed.The result shows that this effect is identical.Meanwhile,in autumn,there exists a wave train which can propagate from North American at high latitudes up to East Asia at low latitudes.This wave train plays a significant role in bringing about circulation situation of the recurving path.