A formula of gradient wind velocity and relative vorticity for typhoon is derived, assuming that the pressure distribution at sea level is circular in the region of typhoon.And the distribution of the wind velocity is derived by introducing the values from the above-mentioned formula to the general solution of equation of motion in the frictional layer as the function of the height and the distance from the center.The height of frictional influence and the value of the other elements are estimated for the region of the typhoon.These calculating methods are tested with the synoptic data about the Typhoon No. 12 (June) which invaded Kyushu district in the year 1954.
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