From the methanol extract of Rhododendron brachycarpum four triterpenes, three phenylpropanes and a diterpene alkaloid were isolated. Their structures were identified as glutinol (1), 3$eta$-hydroxyurs-12-ene (2), $eta$-sitosterol (3), (E)-P-hydrox-ycinnamic acid hexadecylester (4), (-)-rhododendrol (5), (+)-rhododendrol (6), 3$eta$-hydroxyurs-12-en-28-oic acid (7) and gray-anotoxin I (8) by spectroscopic methods. Compound 8 showed moderate cytotoxicity against five cultured human tumor cell lines with $ED_{50}$ values of $3.21~4.05 {mu}g/ml$. The other compounds were of marginal activity against the tested cell lines.