The purpose of this study is to analyze the dynamic and hydrological characteristics of the interannual variability of the northern summer (June-August) ocean-atmosphere system in the Asian-Pacific region. In this ocean atmosphere system, there are two types of interannual variability modes. As indicated by the sea surface temperature (SST) variability, the first type is related to the variations of the mature phase of the El Niño-Southern Oscillation (ENSO) events. Its temporal variability is characterized by alternations between the maximum phases of the El Niño and La Niño events. Its spatial structure is characterized by an elongated positive (negative) SST anomaly over the tropical eastern Pacific during the El Niño (La Niño) event. The second type is related to SST variability between the developing and decaying stages of the ENSO events. This mode is characterized by warm (cold) SST anomalies in the El Niño (La Niño) event, and warm (cold) SST anomalies near the Peruvian coast during the decaying stage.