In this study,based on the output of historical ocean temperature analysis program conducted by Japan Meteorological Agency and NCEP/NCAR reanalysis project,a relationship between tropical Pacific Subsurface Ocean Temperature Anomalies(SOTA) and East Asian Summer Monsoon(EASM) is proposed and investigated.The results indicated that there is a strong correlation between SOTA during winter and EASM.Among the three leading modes in the tropical Pacific subsurface temperature,the first mode has a dipole pattern,with warming in the eastern Pacific and cooling in the western Pacific,which is closely related to traditional El Niño,the western Pacific subtropical high(WPSH) is enhanced.An anomalous anticyclone with its southwesterly winds dominating over the western North Pacific,carrying abundant moisture to Yangtze River and Huaihe River Basin as well.Subsequently,it favors a positive precipitation anomaly along with a poor EASM,which in comparison with traditional El Niño,demonstrating that the impact of traditional El Niño is more significant than the EASM.The persistence of SOTA during winter could lead to form sustainable effects,affecting the general circulations over East Asian Pacific.When a continuous negative(positive) SOTA in the warm pool moves eastwards,the Sea Surface Temperature(SST) of East Pacific becomes cold(warm),while the strengthening of overturning due to the temperature of cold(warm) sea causes anomalies in the SST.Consequently,a meridional wave train appears over East Asia in the summer.Under the impact of an anomalous Western North Pacific anticyclone,it highly affects the atmospheric circulation and climate as well.