Abstract: Sample plots were set in the continuous distribution area of Pinus armandi in Shiguan and Yuanbaoshan of Yunnan forest natural center. Ground fuel samples were selected from 6 quadrats of 2 m×2 m along the diagonal. The experiments were carried out in a 200 cm×120 cm×32 cm iron combustion bed with a slope of 10°. The ignition and spread characteristics of the combustibles were characterized by measuring the ignition time, continuous combustion time, flameless combustion time, thermal radiation characteristics and burn out rate of the combustibles. The results showed that the ignition time of surface combustibles was 1~3 s. It was easy to ignite. Shiguan's uphill fire continues for a relatively short time. It was about 150 s. The flameless burning of Yuanbaoshan downhill fire lasted for a long time with the maximum of 345 s.The fire rate on Yuanbao Mountain was higher than that on Shiguan. The highest rate of fire damage on the uphill fire was 88.29%, and the highest rate of fire damage on the downhill fire was 76.13%.

Key words: Pinus armandi, ground combustible, fire characteristics, spread characteristics, fire behavior