Abstract: To comprehensively compare the inflammability of plants, a combustion experiment with living branches and leaves of 14 main evergreen woody plant spec ies in Kunming was conducted 9 times during forest fireproof period by using the equipment designed by the authors. Based on the determinations of samples’ moi sture content, igniting time, flaming combustion time, smoke temperature, and we ight loss, a characteristic parameter of inflammability, the ratio of net accumu lated smoke temperature during experimental period to igniting time of per unit mass fuel in comparison to no-sample control was put forward. According to the calculations of this parameter, the inflammability of test plant species was in the order of Rhododendron spinuliferum>Castanopsis orthacantha>Lithocarpus mairei>Michelia yunnanensis>Cyclobalanopsis glaucoides>Camellia pitardii>R hododendron siderophyllum>Myrica nana>Vacinium sprengelii>Cinnamomum gland uliferum>Ternstroemia gymnanthera>Rhododendron decorum>Eurya groffii>Ill icium simonsii. The causes inducing the inflammability difference of the 14 wo ody plant species were analyzed.

Key words: Purple Soil, Arsenic, Form, Availability