Abstract:Polyimide, as a kind of special synthetic chemical material, is widely used in aerospace, rail transportation, electrical insulation, high temperature filtration, special protection and other fields due to its high strength and high modulus, high temperature stability, insulation and flame retardant, etc. However, polyimide materials have some limitations, such as poor interface adhesion, chemically inert, smooth surface, and hydrophobic interface, which lead to the finite dispersion and weak bonding when combined with matrix. Herein, the main approaches of interfacial activation for polyimide materials are reviewed. whereafter, the interfacial active groups of polyimide materials and types of graft materials were introduced. Additionally, the advantages and disadvantages of existing activation strategies and grafting materials for polyimide were discussed. Finally, the modification direction of polyimide material in future was proposed.