The data of SST, SLP, SOI and ONI were used to analyze the ENSO events in the past 37 years from 1980 to 2016. By using empirical orthogonal function analysis and wavelet analysis methods, the mechanism of cycle process between the western Pacific warm pool and ENSO were studied. The results show that there exists a large positive anomaly in the Nino3.4 area SST during the El Nio occurrence, and the large abrupt change of the SSTA in Nino3.4 area can be used as an index to better reflect the El Nio event. El Nio event analysis shows that in its formation process, the western Pacific has a gradually enhanced and eastward moving warming center. Also, the eastern boundary of the Warm Pool has an obvious interannual variability feature, with each cycle for 3 to 4 years on average, and a gradually prolonged period; The EOF of sea surface temperature is a good indicator to forebode the occurrence of ENSO; Through the wavelet analysis, it is found that the eastern boundary of warm pool has a good forecasting significance for ENSO occurrence.