Abstract: In this work a method for the separation of Cm from Am is described. The high pressure ion exchange chromatography is used for the system of CH3OH-HNO3-anion-exchange resin. The effects of the concentration of HNO3, the linear flow rate of the eluant and the temperature on the values of bed distribution coeflBcient, plate height, resolution and separation factor have been investigated. It is proposed that most likely the increase of plate height values is mainly due to the particulate diffusion process in this system. The high pressure chromatography technique is found to be extremely effective for the system of CH3OH-HNO3-anion-exchange resin.