The previous paper has described the isolation of five effective constituents: quercetin, quercitrin, hyperin, matteucinol and matteucinin from water extract of dried leaves of Rhododendren simsii planch and their structures were also elucidated. This paper reports the separation and identification of triterpenic acid from ethyl alcohol extract of the planto On the basis of spectral analysis,preparation of its derivatives and in comparison with the control, the structure is determined to be Ursolic acid, which is an effective constituent of an expectorant.