Contemporary China trying to build harmonious society should absorb some positive results which have been achieved by the Western Marxism of Ecology through developing the theory of Marxist classical writers on man and nature,but at the same time,should pay attention to its defects.Its biggest defect is that its criticism of capitalist society is not thorough,and ecological socialism proposed by it is not the real socialism,which is destined that its theory does not contribute to the final realization of the harmony between man and nature.