The dry and wet years in Southeast Asia have been identified and tested by using the Precipitation Reconstruction data set (PREC viz.Precipitation Monthly Anomalies Over Global Land & Oceans from 1948—2003) on annual and seasonal scales from 1948 to 2002.The relation between rainfall and ENSO events has been studied.The results show that in 1948—1959,except summer,wet years,springs,autumns,and winters were evidently more than dry years,springs,autumns,and winters,respectively;in the 1960’s,dry/wet years and seasons were about equal;in the 1970’s,wet years and summers were more than dry years and summers,and wet/dry springs,autumn and winters were about the same;1980—1989 was a frequent period of droughts;and 1990—2002 was a frequent period of droughts/floods with dry years more than wet years.Through calculating the precipitation trend coefficient in Southeast Asia,it was found that a decline trend occurred in annual and seasonal rainfalls except winter.