Abstract: The Spatio temporal characteristics and jump features of maximum, average and minimum air temperature were analyzed based on the temperature data of 40 meteorological stations in Huang Huai Hai plain(3H plain)from 1961 to 2010.The results showed that annual maximum and minimum temperature increased non symmetrically, the minimum temperature changed at the rate of 0.174℃/10y, and the maximum temperature changed at the rate of 0.399℃/10y.Annual minimum air temperature changed at the earliest abruptly in 1997,followed by average and maximum air temperature.The highest percent of maximum, average and minimum air temperature increasing signally was found in February, followed by in September, March and March respectively.As for the season, the highest  percent  of maximum and minimum air temperature increasing signally occurred in winterAnnual maximum average and minimum air temperature also changed asymmetric in majority area.In addition, the quick increasing stations were found mainly in North part of 3H plain.The variational characteristics of maximum, average and minimum air temperature indicated that their jump year and place were all apparently different.The earliest jump year of maximum, average and minimum air temperature were 1981 in Qinhuangdao(Hebei province), 1981 in Zhengzhou(Henan province)and 1974 in Chaoyang(Shandong province)respectively.Furthermore, the latest jump year of these three temperatures were 2002 in Jinan and Chaoyang(Shandong province), Kaifeng(Henan province), Xuyi(Jiangsu province), 2003 in Langfang(Hebei province), Huimin(Shandong province), Kaifeng, Xuyi, and 2003 in Shijiangzhuang(Hebei province), Xuyi.

Key words: Air temperature, Spatio temporal characteristics, Jump features, Huang Huai Hai plain