As a cultural synthesis, the landscape itself is the dialectical fusion of material foundation and superstructure. The latter relates to the ethical significance beyond its artistic functions of aesthetics and entertainment. The former determines that it cannot get rid of the practical relevance of the political economy. Jane Austen's renowned novel Mansfield Park provides an essential reference for the display of both. Based on the Postcolonial theory and Marxist thought, this paper analyzes the moral consciousness and political unconscious. It proves that it embodies the historical details of the development of landscape history, which has become a text device to reveal the political and economic relations of the capitalist world system so that it is more reasonable to continue to be alert enough to the complicated significance of the landscape.