Abstract: The intensity of tropical cyclone (ITC) estimated by digitized cloud imagery is compared with that observed by aircraft weather reconaissance from Guam and by the wind data from the landing tropical cyclones. It is shown that the mean absolute error of this scheme is less than 3m· s-1. In the paper, the operational experiments in 1994 are given. The results show that the scheme can basically meet the needs in daily operations for analyzing and forecasting tropical cyclones.