Studied is a rainstorm event,which occurs in the west of Anhui Province on June 23,2002.By taking the finite sonde data as large-scale background field,the 3-D small and meso-scale wind field,which is very difficult to be acquired by regular sonde data,are retrived in use of quasi-4-D variation analysis together with the aid of CINRAD-98D Doppler radar data in Heifei.Then the meso-scale weather system inducing strong precipitation is investigated.It is pointed out that the rainstorm center is under the wind shear,above which convergence center and the maximum positive vorticity exist.Results show that the variation method is a efficient way to retrieve 3-D wind field data from Doppler radar data.Using the radar data to reflect the meso-scale synopic system and taking large-scale background fields into consideration,the method embodies the practical weather very well through the mutual implementing between them.The effective appalication of Doppler radar data into weather forecast is very helpful to explore the more detailed struture of meso-scale synoptic system and provide more exact initial field for meso-scale numerical forecast model.