Abstract: Based on long-term field investigation data of Ostrinia furnacalis occurrence in plant protection station of Liaoyang and the related meteorological data in Liaoyang meteorological center from 1994 to 2004,3 factors controlling Ostrinia furnacalis occurrence were analyzed and the model of Ostrinia furnacalis occurrence was established.The results showed that the intensity of Ostrinia furnacalis occurrence in current year was mainly related to the average temperature of January,swamping quantity of May in last year,and larva quantity of October in last year.Controlling larva quantity of October was important to prevent and cure insect pest of the corn borer occurrence in next year.At the same time,the intensity of insect pest obviously took on periodic changes.