As one of the storage methods of water resources on the earth,snow cover has an important impact on soil moisture and freshwater distribution.The north-south crossing latitude in China is about 50°,and snow cover is widely distributed.It is of great significance to study the spatial and temporal dynamics of snow cover.Based on the snow cover data of FY-3 meteorological satellite,this paper proposesa trend extraction method based on empirical mode decomposition,and discusses the spatiotemporal dynamic change trend of snow cover in China from 2010 to 2019.Results show that:1) Snow cover frequency (SCF) in China has significant seasonal characteristics,which increases first and then decreases.The SCF reaches the maximum in February and March every year.The SCF in Northeast China shows an interannual trend of significant decline,while that in other regions does not change much.2)The overall snow cover rate (SCR) in China (NeiMonggol and Tibet) decreases by about 1.2％ (about 1.5％),while that in other regions does not change significantly.The SCR in main snow cover areas changes from increasing to decreasing in 2016.