Haze or dust haze,mainly consisting of PM10 or PM2.5,can cause a decrease of visibility in the air.In recent years,with the rapid development of urbanization,the urban air pollution becomes more and more serious,and the number of days that dust haze occurs has increased.The formation of dust haze,the chemical component and the damage of dust haze weather are introduced.The study of the effects of dust haze weather on human body from the epidemiology is also reviewed.