Abstract: Using GMS infrared imagery we have summarized four cloud characteristics relative to the intensity of tropical cyclone as follows: the position of the circulation center relative to deep connective cloud; the characteristics of the eyes form and its size and the degree of clearness in the eye; the characteristics of central deep connective cloud; and the characteristics of spiral cloud band. To each characteristic we assigned an index of tropical cyclone intensity. Synthesizing these four indices we obtained a T number characterizing the intensity of the cyclone. We correlated the T number with the central maximum wind speed of tropical cyclone and obtafined empirical formula Vmax=7.813(T-1).It is found that we can estimated the maximum wind speed of the tropical cyclone using the GMS data.