The severe wind which took place in the morning of April 10, 2006 in Lij iaping town, Shuangpai County, Hunan Province was analyzed based on the postdi saster inspection data, conventional weather data and Yongzhou Doppler radar dat a. It shows that the severe wind was the first confirmed tornado in Yongzhou Cit y in normal meteorological records. It was a supercell tornado, and had classica l tornado hook characteristics in the radar base reflectivity. The strong vertic al wind shear and thermodynamic instability resulted in a mesocyclone in the s upercell. The convergence of on low and middlelevel atmosphere in the mesocycl one resulted in the tornado finally.