Abstract: In order to control Ostrinia furnacalis better in the field, the occurrence regularity of O. furnacalis in the field was studied in Harbin. The development progress of the overwintering generation of larvae was investigated by dissecting the corn stalks in spring, and the dynamics of male adults were monitored by using sex pheromone. The results suggested that the over wintering base of O. furnacalis in Harbin district from 2019 to 2021 was 8.6-9.5 pre 100 stems, and the survival rate was 85.0%-89.1%. The initial pupation period was about May 20, the full incidence period of pupation was from May 26 to June 18, the peak pupation period was about June 10, and the initial eclosion period was about May 27. The peak period of overwintering generation of male O. furnacalis in the field was from June 17 to June 24. Based on the above results, the occurrence regularity of O. furnacalis in Harbin district was the overwintering generation of O. furnacalis began to pupate in the middle and late May, the peak of pupation in the early to middle of June, at the end of May began to eclosion, and the male adult moths appeared in the field in the middle and late June. The peak period of the second generation male adult moths in the field occurred in the late July to the middle of August.