This study focused on pollution characteristics of PMz.s in Urumqi, analysed the correlation between variation of mass concentration and various kinds of meteorological factors. Using HYSPLIT Model of United States Air Resources Laboratory for traceing and tracking analysis on particulate matter in each season, provided an important basic data for a correct understanding of PM2.5 pollution situation in Urumqi, and provided references for comparative research of pollution control measures in the future. The result showed that: (1) the highest value of PM2.5 mass concentration was in January, affected by heating period, the PM2.5 mass concentration in winter was the annual maximum. (2) the mass concentration of PM2.5 with the temperature was negatively correlate, and there was a positive correlation with the air pressure; in the premise of no precipitation, the mass concentration of PM2.5 with the relative humidity was positively correlate. (3) PM2.5 mainly from Alashankou, Northern Ahay and Southern Xinjiang in spring, summer and autumn. In winter it was mainly from Southern Xinjiang. Particulate matter reached in Urumqi were mostly move to direction of Hexi Corridor and Alashankou.%重点研究乌鲁木齐市大气中PM2.5的污染特征，分析其质量变化浓度与各种气象影响因素的相关性．利用美国空气资源实验室的HYSPLIT模型对颗粒物进行备季节代表月份的溯源和追踪分析，为正确认识乌鲁木齐市区大气PM2.5污染状况提供重要基础数据，为以后的对比研究和制定相应的污染控制措施提供参考依据。结果表明：（1）PM2.5质量浓度的最高值出现在1月，受采暖期的影响，冬季PM2.5质量浓度全年最高。（2）PM2.5的质量浓度与温度呈负相关性，与气压的呈正相关性；在无降水的前提下，PM2.5的质量浓度与相对湿度呈正相关。（3）春、夏、秋三季PM2.5来源主要是阿拉山口、阿勒泰北部及南疆，冬季则主要来自于南疆。到达乌鲁木齐的颗粒物主要向河西走廊及阿拉山口方向移动。
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