By using the automatic weather station data and the GFS(Global Forecast System) reanalysis data with high spatial(0.5°×0.5°) and temporal resolutions from NCEP,this paper analyzes the causes of precipitation difference between the northwest and northeast Hubei in a torrential rain process during 1—2 July 2008.Results show that:1)The impermanent precipitation in the northwest Hubei severely occurred in the development of upper and lower-level jets,and located in the right front of a later upper-level jet quickly,which goes against continuous rainfall.The precipitation in the northeast occurred in the stationary stage of upper-level jet and the development period of lower-level jet,and the coupled upper-lower jets induced the formation of mesoscale vortex at the lower level,so the rainfall was heavy and sustaining.2)Moisture transport concentrated in a short time in the northwest,so it was finitely offered.In the northeast,the moisture transport concentrated in a long time,so it was abundantly offered.3)The unstable energy was released faster in the northwest.In the northeast,the unstable energy was always released,meanwhile,the synoptic scale system developed violently and inspired gravitational waves,which were conductive to the precipitation.4)The frontogenesis in the northwest located in the frontal zone,which sloped northward with height,and the heavy rainfall ended soon when the cold air moved southward.In the northeast,the frontogenesis located in the warm frontal zone sloping to the south with height,which was also beneficial to the long-time heavy precipitation,when the confrontation between the cold air and the southwest warm moist air outside the subtropical high led to the strong declination term frontogenesis.