The factors affecting snow depth were systematically analyzed based on a developed snow depth model and the data of AMSR-E passive microwave brightness temperature and snow depth measured by 43 meteorological stations in Qinghai Province during 6 snow seasons from October to next March from 2002 to 2008,and then the approaches of screening samples in the study area were put forward.The regression analyses of horizontal and vertical polarization brightness temperature difference data of 18 GHz and 36 GHz ban...