利用大兴安岭地区7个气象站1975～1992年的积温(≥10°C)、月平均相对湿度、降水量、温度观测资料和1989～1990年当地落叶松毛虫普查资料,对大兴安岭林区落叶松毛虫大发生前各气候因子的变化情况进行分析,发现了一些规律。选择了三种气候因子的复合经验指数——干燥度、湿润度、温雨系数,分别分析了它们与松毛虫发生的关系。 Based on the accumulated temperature (≥10 ° C), monthly average relative humidity, precipitation and temperature of seven weather stations in Daxing’anling from 1975 to 1992 and the census data of the local deciduous pine caterpillars from 1989 to 1990, Before the big occurrence, the changes of climatic factors were analyzed and some laws were found out. The composite empirical indices of three climatic factors - dryness, wetness, and warm rain coefficient were selected and the relationship between them and the occurrence of pine caterpillars was analyzed.