Objective:To study the chemical constituents of the leaves of Craibiodendron Yunnanese W.W.Smith.Method:The chemical constituents of Craibiodendron yunnanese W.W.Smith were extracted by 65% ethanolic.Then the chemical constituents were isolated and purified by Diaion and silica gel.Their structures were elucidated on the basis of spectroscopic evidences and physicochemical properties.Result:seven compounds were isolated and identified as catechin(1),3,3',4',5,6,7,8-heptahydroxyflavan(2),Pentadecanoic acid(3),quercetin(4),3β-hydroxyurs-12-en-28-oic-acid(5),palmitic acid(6),Benzoicacid,4-[2-(4-methoxyphenoxy)ethyl](7).Conclusion:Compounds 1,2,3,5,7 were isolated from the leaves of Craibiodendron yunnanese W.W.Smith for the first time.