Two novel compounds, 1 alpha-methoxy-3 beta-hydroxy-4 alpha-(3',4'-dihydroxyphenyl)-1,2,3,4-tetrahydronaphthalin (1) and 1 alpha,3 beta-dihydroxy-4 alpha-(3',4'-dihydroxyphenyl)-1,2,3,4-tetrahydronaphthalin (2), were isolated along with six known compounds 3-8 from the rhizomes of Cyperus rotundus. This paper reports the isolation and full spectroscopic characterization of these new compounds by NMR, UV, IR and MS data.