There are seemingly controversial arguments in Marxs works on morality. For one thing,we can explicitly find his rejection of morality,and contemporary west scholars,especially Anglo-American scholars who have devoted in Marxist moral theory hold that Marx is an amoralist,even anti-moralist.For another,we can also discover his moral cri-tiques on capitalism.For this reason,it has great practical significance to clarify the relationship between Marxism and morality.This topic will be elucidated under the background of histori-cal materialism and clarified from two aspects in this essay:to make sure why Marxs critique of capitalism does not base on moral principle and point out diametrically theoretical founda-tion between historical materialism and traditional morality;to clarify in what sense Marx is an amoralist,and emphasize it is in his rejection of abstract morality as guiding principle of critici-zing capitalism that he is an amoralist.