With the promotion of energy-saving and exhaust reduction policy, the application of diesel engine has been further extended.The formation and harm of nitrogen oxides(NOx)and particulate matter(PM)were mentioned in detail, which are major pollutants in diesel exhaust.Reviewed the research progress and application of diesel engine exhaust emission control technology, fuel quality improvement, internal purification and after-treatment are introduced separately.Finally, the future development direction of exhaust emission control technology was given combining research situation of diesel engine.