Vemicia montana Lour. (Euphorbiaceae family) is a medium tree with straightly circular trunk. Its wood is used in the light industry and essential oil from its seeds is used in painting, etc. It distributes naturally in China, Laos and Vietnam. By using biological and physiological methods on Vemicia-montana in the forestry laboratory of the Vietnam Forestry University, results showed that Vemicia montana has not multi-epidermis and covered hairs, the rate of palisade and spongy parenchyma is 0,75. The average number of stomata is 562/mm2. The total content of chlorophyl in fresh leaves is 6,24mg/g and rate of a/b chlorophylls is 2,28. Magnitude of evapotranspiration is 2.018g/dm2/h and water attraction is 13,53 atm. Leaf tissues come to harm by 40-50 percent at 45°C, by 80 percent at 50°C and die completely at 60°C. From all above evidences, the authors concluded that the light demand of Vemicia montana is not high. Tree losses water easily, but its ability of water attraction is weak. Hence, this influences on the growth and development of the tree at dry period.