Abstract: This paper aims to reveal the variation characteristics of the abnormal changes of ocean temperatures in the equatorial central & eastern Pacific, and the influences these changes bring to the precipitation and temperature in Changzhi. According to the data of eleven county stations of Changzhi, the author analyzed the precipitation and temperature change tendency in Changzhi since 1961, and investigated the occurrences and variations of El Nino/La Nina events, and how the events affected the annual precipitation, annual mean temperature, drought and flood in Changzhi. The results indicated that: (1) there were 15 El Nino events and 14 La Nina events from 1961 to 2014, and the probability of occurrence was 0.28 and 0.26 respectively; (2) El Nino events mainly occurred in spring and summer while ended in autumn and winter; La Nina events occurred mainly in spring and autumn while ended in spring and winter; (3) abnormal precipitation years in Changzhi were also the years in which El Nino/La Nina events occurred or ended, and the starts of El Nino events had an opposite climatic anomaly to the ends of El Nino events; (4) the annual mean temperature in Changzhi had a good corresponding relation with El Nino years; (5) there was a close relationship between droughts and floods in Changzhi and El Nino/La Nina Events.