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The NCEPNCAR data is used to analyze the structures of the Bengal storm landing on 29 April 2006, before and after the landfalling, by means of the WRF (Weather Research and Forecast) mesoscale numerical model. The results show that the structure of the Bengal storm changed remarkably before and after the landfalling, from a symmetric tropical cyclone to a baroclinic asymmetric cyclone, and the structure and moving track of the storm, as well as the rain belt in Yunnan Province, are well reproduced by the WRF model.