Using the global land three months monthly data(PREC/L),the temporal-spatial features of secular variations of the global land rainfall of March to May during 1948-2001 are investigated.Results indicate that the global land rainfall of March to May mainly shows a negative trend feature especially in tropic Africa,the mid-west of Asia,the mid-east of China,the east of Russia,the Endebi land and Welks land of Antarctica.Seven regions experience an increase in precipitation,and they are the northwest of Russia,the southwest of America,the southwest of Canada,the south of South America,and the north of Canada etc.The trend variations of March to May averaged rainfall over 35 latitude zone are also examined,and the relation between global land seasonal rainfall and ENSO is discussed.Results show that the relation between seasonal rainfall and ENSO for spring is the most indistinctive among Spring,Summer and Autumn.