By using Fujita's pressure mode, radius of the largest wind speed and inner deflection angleof wind direction in the primitive equations, we have derived the formulas suitable for calculating distribution of wind speed of tropical cyclones over the sea. The experiment shows that the calculated resultsin accord with those of different types of observational tropical cyclones, strength and direction pattern.The results of wind field are pretty good for the simulation of tropical cyclones which are influenced bysubtropical high.