中文摘要：

指出了随着我国道路运输的不断发展和能源的日益紧缺，柴油机由于具有负荷大、比油耗低、热效率高、坚固耐用、经济性好等诸多优点，使其受到更多人的青睐。探析了目前柴油机排放所产生的环境问题，阐述了目前有关汽车尾气排放污染控制的研究及各自的优点与不足。主要分析了SCR技术的突出优点，国内外研究现状以及在应用中有待解决的一些问题及发展方向。

英文摘要：

With the continuous development of road transportation and the shortage of energy, the diesel engine is favored by many people because of its advantages such as large load, low fuel consumption, high thermal efficiency, strong durability, economy and so on. But with the increasing sales of diesel engine, the higher nitrogen oxides （NOX） and particulate matter （PM） emissions on the atmospheric environment and human health caused some damage. Urgent need for cost--effective, suitable for large scale promotion of SCR exhaust after--treatment technolo- gy and devices. At present, there are a lot of researches on pollution control of automobile exhaust emissions, and there is a good situation in which various technologies compete with each other, and each technology has its own advantages and disadvantages. This paper introduced the outstanding advantages of SCR technology, the current situation of research at home and abroad, as well as some problems to be solved in the application and its developmentdirection.