Abstract: This article attempts to analyze the origin of post-colonialism in view of interaction between the historical evolution in the West, that is, the modern history, contemporary history and post-contemporary history, and new modern schools of thoughts in the West, namely, the cross-culture theory, third-world theory, globalization theory, and cultural studies. It holds that the core of post-colonialism can be illustrated in three logically related aspects as follows: revealing the essence of various "studies", pointing out the nature of "rights" behind "knowledge", and suggesting the concept of cultural imperialism. It maintains that combining the course of discussions over post-colonialism with the logic of post-colonialist theories will inevitably give rise to four basic issues: duality of Western thought, “reality" of non-Western culture, definition of the ego of non-Western culture, and text of others or text of the ego as well.