对融合PS与小基线In SAR技术提取的北京市583 129个观测点2003—2009年28个时序的实际数据进行了分析,结合北京市的第四系沉积物岩性与厚度分布情况、北京市地下水抽采地点与取水量等实际数据,分析了北京市平原地区2003—2009年的地面沉降的控制因素,得出了第四系沉积物岩性与厚度是控制地面沉降的地质内因,而人工抽采地下水是导致地面沉降的主要的人为外因的结论。 The actual data of 28 time series of 583 129 observation points in Beijing from 2003 to 2009 extracted from the fusion PS and the small baseline In SAR technique are analyzed. Combined with the lithology and thickness distribution of Quaternary sediments in Beijing, Beijing Groundwater pumping sites and water withdrawals, the author analyzed the control factors of ground subsidence from 2003 to 2009 in the plain area of ​​Beijing, and concluded that the lithology and thickness of the sediments in Quaternary system are the geological internal factors that control ground subsidence. However, Groundwater pumping is the main anthropogenic external cause of land subsidence.