1. Hazards of forest fire: Forest fire is the most dangerous enemy and the most terrible disaster in forestry, which will bring the greatest harm and devastating consequences to the forest. Forest fire will not only burn patches of forest, harm the animals in the forest, but also reduce the regeneration ability of the forest, cause soil impoverishment, destroy the function of forest to conserve water, and even lead to imbalance of ecological environment. Despite the rapid development of science in the world today, human beings have not made great progress in putting out forest fires.

2. Types and classification of forest fires: According to the burning position, spreading speed, damaged position and degree of forest fires, forest fires can be roughly divided into three categories: surface fires, crown fires and underground fires. According to the affected forest area and casualties, forest fires are divided into general forest fires, large forest fires, major forest fires and particularly major forest fires.

3. Fire weather: In the case of forest combustibles and fire sources, whether forest fires can occur mainly depends on fire weather. Generally speaking, fire weather is also a favorable climatic condition for forest fires, such as high temperature, less precipitation, low relative humidity, strong wind and long-term drought.