Thermosetting polyimide is one of the most excellent heat resistant materials in organic material systems. The fiber reinforced thermosetting polyimide composites have been widely used in the field of aeronautics and astronautics. However, the further application of high toughness polyimide composites in many fields is limited due to the lack of toughness properties. Therefore, the development of high toughness polyimide composites has gradually become a hot research
topic in recent years. In this article, the research status and development trend of toughening methods of thermoset polyimide composites are reviewed, including a series of methods such as the modification method based on molecular main chain structure, thermoplastic polymer blending thermosetting polyimide and thermoplastic polymer interlaminar toughening polyimide composites.