Southeast Tibet forest is in east subtropical zone. This region natural environment is unique, influenced by the southwest monsoon, so forest fires are very easy to occur in the dry season. Forest in this region is over mature forest, and accounts for much proportion. Fire season in this area is winter and spring. But in the special year, forest fires can also occur in the hot summer. Fire season lasts from October to next February, but to April in an individual arid year. Most of the fires in this area are surface fires, crown fires can occur after long time drought. Ground fires do not occur in the region. This region natural environment is unique, influenced by the southwest monsoon, so forest fires are very easy to occur in the dry season. Forest in this region is over mature forest, and accounts for much proportion. Fire season in this area is winter and spring. But in the special year, forest fires can also occur in the hot summer. Fire season lasts from October to next February, but to April in an individual arid year. Most of the fires in this area are surface fires, crown fires can occur after long time drought. Ground fires do not occur in the region.