Epic stories and ideas have capacities, some of which feed revolutionary and liberating resistance movements, and others serve anti-human and dictatorial regimes and various forms of fundamentalism. This epic capacity of Iran has caused them to appear in the form of epic poems, sometimes in the pages of historical works, and sometimes in the form of novels and historical stories, depending on the needs of each period, and to fulfill their function. Historical novels, as one of the newly emerging literary genres in the Qajar period, have a deep connection with epic narratives and ideas that writers have used with various goals and methods; therefore, conducting research with the aim of examining the goals of the writers, the manner of their application, and even the developments that led to epics and epic ideas in these works is essential for literary researchers. Therefore, in the present study, using library resources and descriptive, analytical and comparative methods, the following results were obtained: 1. In the historical novels of the first period (1284-1300), considering the danger of the destruction of Iranian identity against foreigners, the authors sought to promote epic ideas with an educational perspective to create a spirit of resistance, unity and defense of the land; 2. In the works of the second period (1300-1320), the epic element is a tool in the service of the court and the expression of the nationalist ideas of the first Pahlavi; 3. In the third period (1320-1332), under the influence of the entry of the Allies into Iran and the instability of the court, epic ideas stagnate and stories and heroes of the Ayyar take the place of heroes and epic ideas.