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Based on routine monitoring data of air quality and meteorological data in Shantou City during 2015 -2019, temporal-spatial variation characteristics of O3 pollution and its correlation with meteorological conditions in Shantou City were explored. The research results showed that O3 pollution days in Shantou City showed an increasing trend year by year, and O3 pollution had far-distance transportation and the development trend from offshore Nan'ao Island to urban district. In spring and autumn, there was serious O3 pollution, and it was the most prominent in October. Its diurnal variation in O3days was mainly wide-peak type in the afternoon, showing as that O3 concentration declined slowly after the noon. In O3 pollution days, higher O3 concentration was easy to appear at night, causing that O3peak in the second day was uplifted, and there was continuous O3 pollution. Combining backward trajectory analysis chart, it was found that Shantou was mainly affected by coastal transport of northerly polluted air mass, and it was transported into Shantou City from the east to the northeast. O3 from long-distance transmission superimposed with locally generated O3 which commonly pushed up the level of O3 concentration. The weather of O3pollution in Shantou City had the characteristics of high temperature and low humidity. There was 25 -- 30 °C of temperature interval and 46% --60% of relative humidity interval, and it was accompanied by grade-2 easterly wind. [ABSTRACT FROM AUTHOR]