The phenomena of earthquake light in nearly 35 years in Linzhou city of Henan province are summarized and described in this paper.It is found that there is a corresponding relationship between the earthquake light anomaly appearances and occurrence of moderate-small earthquakes in Linzhou area or its adjacent area.The forming mechanism of the ligh is analyzed with the geological structure and the distribution of lithology（quartzite） in Linzhou area.The observation of the ligh and how to use it in earthquake prediction are discussed at last.