This paper retrieves and studies the three-dimensional wind fields of the heavy rain on 26th-27th June 2003 in the Huaihe river basin,using the volume scan data of the dual-Doppler radar located in Hefei and Maanshan cities.The meso-β-scale convective system(MβCS) and the meso-γ-scale system on the MβCS played important role in this heavy rainfall.The wind retrieval shows that the heavy rainfall was triggered and maintained by the meso-β-scale convergence line at the low-middle level,and the strong convergence and positive vorticity areas in the low-middle layer of the MβCS superposed over the surface intense rainfall centers.The three-dimensional kinematic structure model of the heavy rain is also given.