Abstract: The monthly Jupiter and Saturn apparent declinations has been calculated by using general astronomy software SKYMap Pro Version 8,and comparitively studying the ENSO cycle and the key areas of equatorial Pacific sea surface temperature anomalies.The findings were that there was link between the two,namely,as the declination of Jupiter changes from positive through the equator to negative,EL-Nino event is likely to happen and the event duration is longer.Before 1980's this situation happened 3 times corresponding to the case of longer EL-Nino events. After 1980's at the two frequently-occurring stages of EL-Nino,the centers took place during the Jupiter declination conversion period from positive to negative.EL-Ninos offen occur in the vicinity of the declination positive extreme value of Jupiter,and rarely in the negative values.LA-Nnia events tend to occur between the maximum and the equator of the Jupiter declination before 1980's,but after 1980's,it occurred in the vicinity of the negative extreme values of the Jupiter declination.The position of Jupiter declination in some EL-Nino events is located in a nearly straight line. Over the past 60 years there have been four such lines.Therefore,the EL-Nino events can be divided into four groups,each group composed of 4 events accurately. When Saturn declination moves towards or away from the equator (in about ±5°—10°), EL-Nino occurs, but rarely occurs in the equatorial regions.