Abstract: At present,there is no unified verification method for the quality management and operation and maintenance assessment technical system of ambient air quality automatic monitoring in our country. Combining with the situation of checking the operation and maintenance quality control assessment of automatic air quality monitoring instrument in the province in recent years,this paper discussed some problems encountered,and tentatively put forward the technical methods and technical route of external operation and maintenance assessment of provincial control stations. The feasibility of the method and suggestions for further improvement were pointed out.