In this artiele,INDOR method was used to monitor the multiplets of the anome rie protons and the hydroxyl protons of four monosaccharides.The individual peaks of the C₂-C₄ protons in the overlapped multiplets were detected indirectly to obtain the NMR parameters-chemical shift δ and coupling constant J.By means of the Karplus eduation,the orientations of all the C-H bonds wer) determined.The contigurations and conformations of these sugars derived from INDOR are as follows:β-L-arabinopyranose chair form (⁴C₁);α-L-rhamnopyranose chair form (¹C₄);α-D-xylopyranose chair form (⁴C₁);α-D-and β-D-mannopyranose chair form (⁴C₁).