Three new nor-dammarane triterpenoids, 12b-O-acetyl-15a-hydoxy-3-oxo-17-en-20,21,22-23,24,25,26,27-octanordammanran (1), 12b,28-O-diacetyl-15a-hydoxy-3-oxo-17-en-20,21,22-23,24,25,26,27-octanordammanran(2), 12b-hydoxy-3,15-dioxo-20,21,22-23,24,25,26,27-octanordammanran (3), together with one known compound,12b-O-acetyl-15a,28-dihydoxy-3-oxo-17-en-20,21,22-23,24,25,26,27-octanordammanran (4), were isolated from the 95 %EtOH extract of Dysoxylum hainanense. The structures of thenew compounds were elucidated by spectral methods. All thetriterpenoids were in vitro evaluated for their cytotoxic activitiesagainst four tumor cell lines (BGC-823, U251, HepG2and SGC-7901). All the three nor-dammarane triterpenoidsexhibited particular significant cytotoxic activities againstglioma cell line.