Abstract: A method of processing weather radar data of HUAMEX was presented, and an integration application system was established, including (1) converting raw data format into united format and verifying raw data, (2) producing radar 3-D square grid and latitude-longitude grid data, (3) processing radial velocity, and (4) retrieving rain and mosaic wind filed. 2-D wind field in a hail day was retrieved, and convergence field appearing before echo zone forming was discovered. When the echo moving into convergence field, it became hail. It reveals that hail can be predicted by retrieved wind. In HUAMEX, 3-D wind field from single Doppler was retrieved, and 3-D wind mosaic map was formed by three Doppler radar data, the applications potential for understanding and employing Doppler wind was exhibited.