Abstract: Based on the continuous monitoring data of O₃ and its precursors NO₂ and CO from 10 air monitoring stations and meteorological observation data in the urban area of Guiyang during a natural year from March 1st，2015 to February 29th，2016，temporal and spatial distribution characteristics of O₃，meteorological effects and the relationship with its precursors were studied in Guiyang city. The results showed that the diurnal variation of O₃ showed a "single peak" distribution characteristic，which generally reaching its peak around 16：00 - 17：00. From March to October and in February of the next year，the monthly average O₃ concentration was relatively high，while in November，December and January of the next year，the O₃ concentration was relatively low. O₃-8h-max concentration was positively correlated with sunshine hours，daily maximum temperature and wind speed，and negatively correlated with air pressure and average relative humidity. The O₃ concentration was relatively low in the urban area and relatively high in the suburbs，and the pollution gradually increased from the downtown to the suburbs. The diurnal variation of atmospheric oxidizer O_X was characterized by "single peak" distribution，with the strongest oxidization in spring and summer. O_X was controlled by different factors during the day and night. O_X was mainly controlled by O₃ during the day and NO₂ during the night，respectively.

Key words: Guiyang, ozone（O₃）, meteorological effects, precursors, atmospheric oxidants（O_X）