There are seemingly controversial arguments in Marx＇s works on morality.For one thing, we can exphcidy find his rejection of morality, and contemporary westernscholars, especially Anglo - American scholars who have devoted in Marxist moral theory holdthat 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 relationshipbetween Marmsm 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 Marx＇s critiqueof 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 anamoralist, and emphasize it is in his rejection of abstract morality as guiding principle of critici-zing capitalism that he is an amoralist.