Thirteen clinopyroxene megacrysts from Nushan Cenozoic basalts have been investigated by Fourier transform infrared spectrometer(FTIR). The results demonstrate that all samples contain trace amount of structural OH. Clinopyroxenes from Nushan show four groups of absorption bands, in which, 3 472-3 506 cm -1 is the major characteristic one. It is suggested that the position of major band is probably related to Al content: the position of major characteristic band for high_Al samples is around 3 470 cm -1 , whereas that for low_Al samples around 3 620 cm -1 . Thirteen clinopyroxene megacrysts from Nushan Cenozoic basalts have been investigated by Fourier transform infrared spectrometer (FTIR). The results demonstrate that all samples contain trace amount of structural OH. Clinopyroxenes from Nushan show four groups of absorption bands, in which 3 472-3 506 cm -1 is the major characteristic one. It is suggested that the position of the major band is probably related to Al content: the position of the major characteristic band for high_Al samples is around 3 470 cm -1, that that low_Al samples around 3 620 cm -1.