Abstract: In 2007, Ashok et al revealed a type of tripole pattern sea surface temperature anomalies (SSTA) in the equatorial Pacific region, known as El Niño-Modoki (EM), and defined the corresponding index EMI of SSTA. On this basis, using the monthly mean sea surface temperature (SST) data from Hadley Centre, the NCEP/NCAR monthly reanalysis, the monthly precipitation, and removing El Niño-Modoki (I_EM) from SSTA, we have defined another SSTA index, i.e., EPNI (I_EPN), over Nino1+2 to describe the eastern Pacific SSTA events. Using these two indices, I_EPN and I_EM, a pair of variations of SST anomalies and their influences on climate anomalies over the Maritime Continent (MC) in the tropical Pacific Ocean are investigated. Our results have demonstrated that in boreal summer, when I_EM is in its positive phase, the tropical Pacific SSTA show a structure of "negative-positive-negative". Negative SSTAs are observed in most of the MC region. The anomalous convergence in the lower troposphere and anomalous divergence in the upper troposphere are observed in the central Pacific while the anomalous divergence in the lower troposphere and anomalous convergence in the upper troposphere are observed in MC region. Corresponding to the convergence and divergence centers, there are two zonal-vertical circulations from central equatorial Pacific to eastern equatorial Pacific and to central and eastern parts of MC, respectively. A vertical circulation is also observed from western part of MC to western part of India Ocean at the same time. The atmosphere above MC is adiabatically heated in the north and cooled in the south, while it is heated in the west and cooled in the east of the Pacific Ocean. Precipitation in the area south of 10°N is significantly less than normal, whereas it is more than normal in area north of 10°N in the MC region. When I_EPN is in its positive phase, the tropical Pacific SSTAs show a distribution of "negative in the west and positive in the east", whereas SSTAs in MC region are "positive in the west and negative in the east". In the lower troposphere, the anomalous divergence center is over MC region and the convergence center is over the equatorial eastern Pacific. The anomalous circulation in the tropical region is baroclinic in vertical and the Walker circulation is anomalously weakened. The atmosphere in MC is also heated adiabatically in the north and cooled in the south while the atmosphere in Pacific is heated in most of the tropical region. Precipitation is less than normal in most part of MC and higher than normal in the equatorial Pacific. These results are helpful for us to better understand the variation features of the tropical Pacific SSTA and their impacts on MC region.