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根据吉林省１９７０～１９９７年过火面积超过１００ｈｍ２的火灾个例统计计算，结果表明：①吉林省森林大火主要发生在春季的４，５月和秋季的９月末到１０月中旬，地区主要在延边州的中西部和白山市的东部；②大火的发生与当月当地环境气候的关系是，降水量明显偏少、气温较高、风速较大，但３月的大火主要是气温特殊偏高造成的；③春、秋大火与前期（１２～３月，６～９月）的旱涝指数Ｚ、降水量距平Δｄ、气温距平Δｔ的关系密切．当Ｚ为“－”、Δｄ为“－”、Δｔ为“＋”，即前期连续干旱少雨高温时，未来春、秋季发生大火的可能性最大；若前期连续干旱少雨高温长达６个月，未来可能大火蜂起，因此，遇有这种年份必须立足于预防重大森林火灾的发生．
According to the statistics of fire cases with an area over 100hm2 in Jilin Province from 1970 to 1997, the results showed that: (1) Forest fires in Jilin Province mainly occurred in April and May in spring and late September to mid-October in autumn, mainly in Yanbian And the eastern part of Baishan City. (2) The relationship between the occurrence of the fire and the local climate and climate of the current month is that the precipitation is obviously less than normal and the temperature is relatively high and the wind speed is relatively high. However, the fire in March was mainly caused by the exceptionally high temperature. (3) The flood and drought index Z, precipitation anomaly Δd and temperature anomaly Δt in the spring and autumn fires and the previous period (December-March, June-September) are closely related. When Z is “-”, Δd is “-”, and Δt is “+”, that is, there is a high possibility of a big fire in spring and autumn in the early continuous drought and rainy days. If the earlier period of drought is less than 6 months, In the future, there may be a fire, so in such a year, we must base ourselves on prevention of major forest fires.