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By use of meteorological satellite images, MICAPS data, and conventional observation data，based on the principles and methods of meteorology and the application of weather satellite images to weather analysis and prediction, the process of a heavy rainfall event in Ordos is analyzed. The analysis results indicated： The heavy rainfall was induced mainly by the coactions of an active warmfront cloud system and a middleγ scale cloud storm nested in the bottom of the cloud cluster. Above the Europe and Asia at 500 hPa there was an eastwardmoving stepped westerly trough converging with the northward warmmoist air flow in the Hetao area to the west of the subtropical high. There was a shear line above 700 hPa, and the northern East China southeast wind jet to the north of the Jianghuai cyclone transported water vapor to the northwest. There were three watervapor transport channels conveying water vapor and energy to the Hetao area from the west, southwest, and southeast, respectively. There was a convective unstable stratification of cold at upper levels and warm at lower level. Heavy rainfall occurred in the front of the warmfront cloud zone in the area of the coldfront cloud band breaking, in combination with the favorable advection and divergence.