Abstract: The locust is a main kind of meadow pests in the Inner Mongolia and meteorological conditions have important influence on locust occurrences. The main meteorological factors that affected locust ovum overwintering were the appearance time of first cold wave in the autumn and winter temperature. The soil moisture, time and intension of cold wave affected mainly ovum hatching in the spring. The key factor that affected larva eclosion was the minimum temperature during last ten days in April to first ten days in June.

Key words: Locust ovum overwintering, Locust ovum overwintering, Locust ovum hatching, Larva eclosion, Meteorological factor