Using tropical weather charts,GMS satellite cloud pictures and ECMWF gridpoint wind data,two kinds of typical sustained raifall events in the southeast of Australia:cyclonic frontogenesis process caused by tropical cloud surgecold front wake interaction and return flow rainfall process in the north side of blocking anticyclone,were analysed with different methods.The basic features of the two cases were given in terms of cloud patterns,circulation and tropical flow field.The results can be used as reference in the operational prediction.