This paper highlights an important issue called 'epistemology of research on Mahdism'. The epistemological approach of the research on Mahdism follows the outer second-degree approach and attitude. In doing so, the terms such as knowledge, epistemology, and epistemology of research on Mahdism, are explained in concept and then it is discussed how will be possible to apply the knowledge in the field research on Mahdism. In the process of discussing the epistemology, a role model that will serve research on Mahdism from epistemological point of view is employed and foundationalism is considered as a pattern. In the process of the essay, the theoretical and axiomatic propositions will be clarified and then mechanism of rendering theoretical to axiomatic propositions in foundationalism will be explained. In the following sections, the theorems of the obvious and evident will be addressed alongside areas such as intellectual research on Mahdism, intuitive theorems and propositions drawn from religious texts such as the Quran and traditions of the Imams. At the end, we define a typology of the messianic traditions, narratives, symbols, symbolic signs, The news, Malahamy, emblematic signs.