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采用主成分分析及对比分析等方法，研究了内蒙古大兴安岭１９６４～１９９０年间４９～５２°Ｎ区域内春季特大森林火灾发生与气候条件的相互关系．结果表明，影响该地区春季特大火灾发生的主导气候因子是当年春季的降水和温度，上一年秋季至当年３月期间的干旱少雨是春季特大火灾发生的潜在条件；它与当年春季的高温、干旱迭加，促进了特大火灾的发生。该地区春季特大火灾多发年形成的干旱孕育期为６～１５个月。
Principal component analysis and comparative analysis were used to study the relationship between the forest fires and the climatic conditions in the 49-52 ° N region of the Greater Xing’an Mountains in Inner Mongolia from 1964 to 1990. The results show that the dominant climatic factor influencing the spring severe fire in this area is the spring precipitation and temperature in this area. The drought and drought in the previous year from March to March of the previous year is a potential condition for the occurrence of a severe spring fire in spring. Drought has been added to promote the occurrence of a major fire. The drought period formed in the spring when many large fires occur in this area is 6 to 15 months.