Hagiography research is an Islamic study that deals with the innocents’ lifestyle. This study requires some basic knowledge that is included under the principles of science. For this purpose, inspired by logic and using the eight principles, some of the most important preliminary topics such as: definition, position, topics and goals are examined about the study of history and the nature of this new foundational term is explained. The result of this research, which was conducted in a descriptive-analytical method, shows that the hagiography study is an interdisciplinary field that researches the issues of the biography of the innocents with the help of some Islamic knowledge such as history, tradition, jurisprudence and Islamic theology. Biography research with the subject of innocent action has three main topics: biography, validation and meaning-finding, and studied with the three goals of inference, realization, and modeling.