Da Hinggan Mountains, Heilongjiang, China, has occurred many forest-fires, because of the vast forest area and complex natural conditions, in the past fifty years. The lives and property of the people and the loss of the country's forest resources are heavy. These fires have caused very serious economic property losses and casualties, and produced a large amount of forest damage area. For example, on May 6, 1987, several forest farms in Da Hinggan Mountains, Heilongjiang Province, started to fire at the same time, causing the most serious forest fire since the founding of new China, shocked at home and abroad. The direct economic losses amounted to more than 500 million yuan.