It's based on the world vision that Marx criticizes capitalism. The liberation and the development of backward countries respectively internalizes in the logic of the capitalism critique and the historical process of capitalism. That the victory of socialist revolution in the developed capitalist countries has not been achieved simultaneously has led to the failure in backward countries in leaping over the Caudine Valley of capitalism, which has brought the dual dilemmas between tradition and modernity. It is the only way for backward countries to realize liberation by uniting the global proletariat to occupy and utilize all the positive achievements of capitalism.