Five categories of good-poor years, i.e.best, good, normal, poor and worst, were divided based on yield data per unit area of flue-cured tobacco in Fengyang County,Anhui Province, from 1951 to 1990. Poor or worst years in relation to meteorological disasters,and laws of change.with years were analysed by adopting the harmonic method. The distribution of meteorological disasters in the future is predicted and the corresponding countermeasures is studied.