The localization of a duststorm source is one of the most difficult scientific problems on numerical simulation of the long distance transport process of airborne dust. Traditionally, the duststorm sources are analyzed with a chemical composition analysis method. However, sampling error and uncertainty problem of the composition variation during the large￣scale and long distance transport process in the atmosphere makes the operability of traditional method not strong. In this paper, using a new Lagrangian backward tracing method based on the observed and forecasting data of China Meteorological Administration (CMA), the numerical simulation for a duststorm event on April 9, 2003 has been analyzed. The results indicate that the main airborne dust for the duststorm event comes from Kurban Tonggute desert.%沙尘暴源地的确定技术，一直是沙尘暴空气浮尘浓度场长距离输送数值模拟的最困难的科学问题之一。传统方法通常是使用降尘区的采集样本进行化学成分分析来确定。然而，采样误差和化学成分在大气长距离输送过程中的不确定性，也使得这种方法的可操作性不强。本文使用拉格朗日后向追踪数值模拟的新方法，依据中国气象局( CMA )的气象观测数据及其预报资料对一次沙尘暴事件进行了数值模拟，结果表明∶2003年4月9日的沙尘暴的主要源地来源于吉尔班通古特沙漠。
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