In order to understand the characteristics and sources of ozone(O₃) at Guangmingding peak of Mt.Huang,a typical site of high-altitude area in Eastern China,the data of O₃ concentration (observed during April 18—July 28,2008 and May 19—August 20,2009) were analyzed by using a statistical method (Kolmogorov-Zurbenko filter) and numerical simulation(Weather Research and Forecasting Model) in this paper.The results showed that the value of monthly averaged O₃ concentration of May,June and July were 107.73,101.93 and 68.02 μg·m^-3,respectively;the O₃ concentration in May and June was 25—60 μg·m^-3,which was higher than other Base Stations in China(except Shangdianzi) and Antarctic.However,the O₃ concentration in July was relatively close to that of other stations.The O₃ concentration was relatively at a higher level than in other areas during this period,but over-standard concentration events occurred rarely,which only accounted for 3.9% of the observation time.The diurnal variation of O₃ presented a multi-peak distribution,and the peak value of O₃ appeared from 21:00 to 06:00(Beijing Standard Time,the same below) with a tiny amplitude of 15—20 μg·m^-3 in a day.After simulating the variation of some parameters such as the height of tropopause and clear air turbulence over the area,the result showed that the concentration of O₃ was relative with the fold of tropopause.The O₃ concentration was the highest on sunny days,the lowest on rainy days and median on foggy and cloudy days.There was an obviously negative correlation between O₃ and temperature,relative humid and other pollution gases(CO,NO and NO₂),while it had a relatively weaker correlation with the wind speed.The O₃ distributed evenly during circle wind period in May (the wind direction was dominated by northwest in daytime and by south in nighttime).However,the O₃ concentration was higher during north wind period than that in south wind period in June and July(the wind direction was dominated by southwest both in daytime and nighttime).The raw data of O₃ were decomposed into different components by using the KZ filter.The results showed that the local O₃ concentration was mainly controlled by low frequency component(C_BL component),and the rest high frequency components(C_SY,C_DU and C_ID components) only made it fluctuate around the baseline.Finally,the contribution of C_SY,C_DU and C_ID components to C_BL component was quantitative analyzed during the two over-standard events that occurred during May 28—31,2009,and June 12—15,2009,respectively.