Abstract: The relationship between the second generation Helicoverpa armigera(Hbner) occurrence degrees and the climate factors was analyzed in Kazuo county, Liaoning Province. The results showed that the drought degree of the last-ten days in June, the average air temperature of the first-ten days in July and the average air temperature of the second-ten days in June were the main factors which affected the occurrence degrees of the second generation Heliothis armigera. And that the factor relatively poor correlated to it was the drought of the second-ten days in July. So the drought and higher air temperature in summer was the important conditions of the Heliothis armigera great occurrence.

Key words: Heliothis armigera, Heliothis armigera, Climate factors, Gray system, Advantage analysis