Abstract: Based on the air quality index and the daily mass concentration monitoring data of six pollutants in 9 cities in the Guizhou province 2015 to 2019,conventional meteorological observation data from the same period,the air pollution distribution characteristics and the municipal primary pollutants of different years and seasons were analyzed. The relationship between the mass concentration of each pollutant and concurrent meteorological conditions was also discussed. The result show that :(1)In general, the air quality in Guizhou province is good,the number of days with excellent and good air quality is more than 90% of the whole year,and the air quality in 2018 was the best in the past five years. (2)The spatial distribution of AQI was characterized by "high in the north and low in the south",the high-value areas were in Zunyi,Shuicheng and Tongren,and Xingyi were relatively low. (3)The mass concentration of the six pollutants were significantly correlated with average air temperature,relative humidity,daily average air temperature,daily precipitation,relative humidity and average wind speed. (4)Pollution days in guizhou province mainly occur in winter,and the primary pollutants were mainly particulate matter (PM_2.5 and PM₁₀). In summer,the number of pollution days was the least,and the primary pollutant is mainly O3.