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Based on the 10 minute maximum wind speed data of 48 weather stations over the eastern Inner Mongolia, the distribution maps of extreme wind speed of 30 , 50 , and 100 year return periods, which are calculated by using the type Ⅰextreme distribution function, are drawn and analyzed. The characteristics of maximum wind speed in 1980-2010 are also analyzed. The results show that the annual maximum wind displayed a phased downward trend in the past 42 years, with the decreasing rate being 14 m/s per 10 years. The annual variation of maximum wind shows a double peak curve with the annual maximum wind in spring mainly. 〖JP2〗The annual maximum wind speed mainly appears in west direction (W to NNW) with a frequency of 70%. In general, the distributions of maximum wind and extreme wind speeds show a decreasing trend from west to east, but has obvious regional characteristics. The results can provide important references for the design, operation, and maintenance of the eastern Inner Mongolia power grid.