Abstract: Science and history communicate closely in all Marx's theories.When Marx generalizes the scientific conclusion in historical materialism,he always transforms it into a historical object to deal with.Just like that,when Marx constructs the historical concept of human society,he always transforms it into a scientific object to grasp.Science and history are the two main lines of Marx's structural historical materialism.However,the two are not compatible in the old metaphysics.The result of intellectual thinking is science,and the deterministic conclusion that science can get is eternal,outside time,and fundamentally rejects history in the real sense;and history,because it is unfolded in time,breaks the taboos of traditional metaphysics.Traditional metaphysics can only discover science,not history -history is human existence itself.Marx puts forward a new view of truth,which is no longer the truth in the sense of metaphysical abstract concept,but the development of concrete reality in history.So historical materialism has become the science of human history with the unity of science and history.

Key words: science, history, historical materialism, metaphysics, science of human history, Marx, Engels