Abstract: The E1 Nino is a substantial atmospheric-oceanic event which impacts weather and climate over the globe, so the prediction for an occurrence of E1 Nino event is very important. Can we estimate when next E1 Nino will happen?This problem is studied with grey prediction model in this paper. Using the data of the chronology of E1 Nino from 1860 to 1986, grey models are built with the year groups composed of the successive five years, for example X₅={1862, 1864, 1868, 1871, 1877 } X₅={1864, 1868, 1871, 1877, 1880 } X₅={1965, 1969, 1972, 1976, 1983 };These models are used to make an one-step prediction and verified with the observations. Meanwhile, the bivariable grey model is also established in relating the E1 Nino event to the southern oscillation index. It is shown that the grey model is able to predict the occurrence of E1 Nino year.