Writing the biography of Muhammad the Prophet, i. e. Sirah, was one of eraly Muslims’ efforts for compiling the knowledge of Islam. Hence, they begin to create a role model of the prophet’ s life, his works and discourse, which can be a sub-category of historiography. The Iranians also have contributed to this tradition, especially in some periods that can be called as the flourishing time of historiography, such as Qajar era. Muhammad Taghi Khan Sepehr has dedictaed a part of his work, Nasikh-ol-Tawarikh to Sirah. Due to significance of his works as an exemplary of history-writing in Qajar era, we explore its similarities and differences with the former works of the same genre. In addition to different quotations in narration of Sirah and references to contemporary events around the prophet’ s life, we can mention the evolution of Sirah narration methods in Qajar era, which were affected by ideological and religious shifts in post-Safavid period, i. e. based on the emphasis on Shiite culture. Besides, theological, narrative and jurisprudential approaches based on Shiite school in Sirah are among the other specific features of this work.