Abstract: Based on the winter air quality and pollutant concentration data from 2014 to 2018, combined with ground observation, sounding and wind profile radar data, the winter meteorological elements and their pollution diffusion conditions in Xindu District were analyzed. The results show that :(1) Different pollutants in Xindu District had the same daily variation characteristics, and the concentration reached the highest around 11:00 am and the lowest at 18:00. (2) The pollutant concentration in Xindu District was closely related to wind speed, temperature, precipitation, and relative humidity. When the wind speed was greater (less) than the average wind speed, the pollutant concentration decreased (increased); the higher the temperature and the relative humidity were, the stronger the pollution would be; the weaker precipitation would aggravate the pollution instead. (3) In the process of polluted weather in Xindu District, the strength and thickness of inversion would affect the vertical diffusion of pollutants, when the intensity and thickness were too large, the pollution was serious.