This paper analyzes the present situation of the atmosphericpollution in Xining city,its characteristics and causes,according to monitoring indications of atmospheric pollution in this city.It also tries to describe the future trend of atmospheric pollution on the basis of monitoring figures in the last five years.The conduction is made that the atmosphere pollution in Xining city is in the rising course in recent five years.%以1998年西宁市大气污染的主要监测指标为依据，分析了西宁市大气污染的现状、特征及原因，并根据近5a的监测数据对大气污染趋势进行了分析，结论是：西宁市大气污染为煤烟型污染，主要污染物为总悬浮颗粒物(TSP)，并且在近5a来呈上升趋势。
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