A Study to the History of Evolution of the Noumenon Theory

Although having not been used till recently, term the has been existed since old times. Invested from its history, noumenom theory can be divided into four parts: ancient, medieval, recent and modern theory. Its modern significance can be revealed in following aspects: changing questioning mode What is to What should be; changing description of existential condition to assessment of meaning of to man's activity. All can be concluded that theory, of which primary principles are its rationality and non-substantiality, is merely a certainty of thinking logical prerequisite in modern philosophical context, and a certainty of noumenon promise entirely different from traditional noumenon.