内燃机车的排放控制已成为人们日益关心的问题。文中介绍了世界上现行的和即将出台的内燃机车的排放法规；解释了柴油机在燃烧过程中生成各种排放物的原因以及中速机在未作任何改进设计时各种排放物的典型排放水平；详细描述了不同程度地降低各种排放物（尤其是NOx）所需要采取的相应的技术措施。 Emission control of diesel locomotives has become a growing concern. This article presents the current and forthcoming regulations on emissions from diesel locomotives in the world. It explains the reasons for various emissions generated by diesel engines during combustion and the typical emission levels of various emissions for medium-speed engines without any improvement ; Described in detail to varying degrees to reduce all kinds of emissions (especially NOx) required to take the appropriate technical measures.