Abstract:This paper reports the studies on 13C NMR spectra of ten steroidalsapogenins. Four of them, 3- cpiruscogcnin (1 ), 3 -epineoruscogenin (2 ),tupisgenin (3 ) and aurantigenin (4 ), belong to the △5-series,Six of them ranmogenin A(5)、B(6)、C(7)、D(8)、△25(27) - pentrogenin(9) and 1β、2β、3β、4β、5β、7α-hexahydroxy-spirost-25(27)-en-6-one( 10) belong to the 5β-series.