RFeO₃ with orthogonal perovskite structure is a class of transparent ferromagnetic materials in the near-infrared wave band, and research on the ultrafast spin reorientation transition of RFeO₃ and its coherence control has become a hot topic in related fields in recent years. As the excitation energy of the basic properties of materials such as magnon and electron spin resonance is within the terahertz energy range, a series of breakthroughs have been made in the terahertz ultrafast optical regulation of RFeO₃ crystals due to the rapid development of THz technology in recent years, which is of great significance to the basic research of magnetism. Combined with the author's research work in recent years, the progress of terahertz optical regulation of RFeO₃ crystals at home and abroad has been reviewed in this paper and the future ultrafast photomagnetic research of RFeO₃ crystals are also prospected.