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We investigated the seasonal and spatial ozone variations in China by using three-year surface ozone observation data from the six Chinese Global Atmosphere Watch (GAW)stations and tropospheric column ozone data from satellite retrieval over the period 2010-2012.It is shown that the seasonal ozone variations at these GAW stations are rather different,particularly between the west and east locations.Compared with west China,east China has lower background ozone levels.However,the Asian summer monsoon (ASM) can transport photochemical pollutants from the south to the north areas in east China,leading to a northward gradual enhancement of background ozone levels at the east GAW stations.Over China,the tropospheric column ozone densities peak during spring and summer in the areas that are directly and/or indirectly affected by the ASM,and the peak time lags from the south to the north in east China.We also investigated the regional representativeness of seasonal variations of ozone at the six Chinese GAW stations using the yearly maximum tropospheric column month as indicator.The results show that the seasonal variation characteristics of ozone revealed by the Chinese GAW stations are typical,with each station having a considerable large surrounding area with the ozone maximum occurring at the same month.Ozone variations at the GAW stations are influenced by many complex factors and their regional representativeness needs to be investigated further in a broader sense.