Abstract: The relationship among East Asia summer monsoon, El Niño and low temperature in Song liao Plain North East China from May to September in 1951-1995 are analysed. In 1950-1970's when East Asia summer monsoon was weak and El Niño temperat ure going up started in the first half a year the low temperature or cool injury in Songliao Plain would take place. During 1980-1995 when East Asia summer monsoon was strong even El Niño temperat uregoing up started in the first half a year the high temperature in Song liao Plain in summer would takepace in the same year and the temperature in Song liao Plian in summer would be lower in the nextyear but there was no cool injury. The oscill ation OLR in typical El Niño year has been analy sed too. The relationship among El Niño, oscill ation of OLR, East Asia summer monsoon, winter monsoon and the low temperature in Song liao Plain North East China has also been studied.