Hydrological and meteorological data observed along 155?E section by the R/V Ryofu Maru of JMA in the summers of 1972 to 1979, were used to analyze and study the characteristics of temperature and salinity in the south tropical, tropical, north tropical, and north subtropical sea areas at this section; the heat contents along the zonal belts; the salt contents to the north and south of the high-salinity cores and their yearly variations; and their relationship to the ENSO phenomenon. During the ENSO events in the summers of 1972 and 1976, the following similar abnormalities in temperature and salinity characteristics occurred: 1. The isotherm within the range of depth from the lower limit of the high temperature water of the upper uniform layer to the 250m in the north tropical belt near 7?to 8?N, became intensely arched, indicating considerable upwelling of cold waters. 2. The heat contents in depth<100m water layer in the north or south tropical belt appeared lower, being a negative anomaly. 3. Occupying volume and salt content of the high-salinity cores in the North or South Pacific Ocean were rather high, being a positive anomaly. Moreover, the high salinity core in the South Pacific Ocean across the equator, might extend further north, reaching as far as 6?N. The occurrence and cause of the mentioned abnormal phenomena are discussed in this paper.