Abstract: About the dialectics question,a popular expression is “Opposition of the Dialectics”.They thought that Engels' dialectics of nature disregards human being,but Marx's view is“the humanization nature”.Marx insists on the dialectics of history.On the contrary,Engels insists on the dialectics of nature.By Reading the history of Marxism,the author thinks that Marx approves of the natural dialectics,and that Engels' dialectics has not neglected the human.With current reforming of Marxist philosophy model,we should set up the ontology boundary consciousness.

Key words: dialectics of nature, dialectics of history, ontology, boundary consciousness