Abstract: Dynamic properties of typhoon Wayne are computed and analysed with soundings from Xisha and Dongsha Islands, coast of The South China Sea and ships, as well as weather reports from airplanes, satellites and ground radars. The result shows that Wayne is asymmetric in its wind speed distribution. Its maximum tangential cyclonic winds locate in the right-forward quadrant. Its vertical wind shear decreaes with the strengthening of the typhoon. The strongest inflow in confined to the portion below 300 hPa in the southern semi-circle. The maximum inflow is around 700 hPa and the greatest upper-level anticyclonic outflow is near 150-100 hPa. The outflow is mainly in the northern semi-circle. Additionally, the vertical motion of Wayne is found to be closely related to its development and location.