Fernand Van Steenberghen (1940-1993) was an important scholar of contemporary scholastics and a professor at the Institut superieur de philosophie, Universite catholique de Louvain, which became the Centre for Husserl's Phenomenology. Under the influence of phenomenological methodology, van Steenberghen ingenuously brought the phenomenological methods of consciousness analysis into the reinterpretation of Thomas Aquinas's epistemology to build an epistemological system in the disguise of phenomenology, which actually is an development based on Thomas Aquias's epistemology combining the ancient truthfulness and the modern creativity. In Van Steenberghen's Epistemology, the related study is divided into Epistemologie analytique ou descriptive and Epistemologie Critique, while the study of logic is omitted here, for traditional study of logic has made a system of its own. The focus of this paper is to make an outline of the first part of the book, "Epistemologie analytique ou descriptive," in contrast with Thomas Aquinas's original text.