Diospyros decandra is a plant in the same family Ebenaceae are a local plant of the country Thailand, which has reported a study of plant nutrients such as family Ebenaceae, pentacyclic triterpenes found and juglone has also taken parts of Diospyros decandra shell studies. They found the same substance, such as triterpenes, but have not yet reported the effect of Diospyros decandra, education section. Therefore we strive to separate chemical elements and evaluation of antimicrobial activity of sandalwood on pure service.