Peirce, I think, was undoubtedly the greatest figure in the history of American Philosophy and also one of the most prominent thinkers in the modern West. He contributed so much to the treasure-house of the human mind, and his thought is so comprehensive and profound that it is not easy to grasp every aspect of his philosophy. Therefore, I"d like to limit myself to a discussion of just one small but important part of his philosophy: his theory of knowledge. And although he warned us that "every person who wishes to form an opinion concerning fundamental problems should first of all make a complete survey of human knowledge" (CP 6.9), I neither will nor could make a complete survey of Peirce's theory of knowledge in this paper, but I will just discuss several points of it.