Abstract:A mature and strong El Niño was present in the tropical Pacific Ocean during the autumn to winter in 2015. This 2015/2016 El Niño is one of the strongest El Niño events in the past twenty years. Based on the introduction of El Niño definition, features, causes, and general physical processes of the impact on East Asian monsoon, this paper presents the influences of the El Niño event in the variability of Indian Ocean sea surface temperature, and addresses that there will be excessive rainfall in the main rain belts, i. e. the spring rain in south China, early summer rainfall in Southeast China, Mei-yu in the valleys of Huai River and Yangtze River, and rain period in North and Northeast China during the decay period of El Niño events. The associated mechanisms are unraveled. Furthermore, it is documented that the current super El Niño event contributes to the large range of environmental pollution in Eastern China in December of 2015. At last, the forecast to the pattern of the main rain belts in East China in the coming spring and summer is displayed.