Polyimide(PI) has been widely used in electronic packaging because of its excellent electrical,mechanical and thermal properties. Due to the low intrinsic thermal conductivity of PI, it is important to enhance the thermal conducting properties of PI to meet the requirement of heat dissipation in modern electrical system. In this paper, the research progress of thermal conductive and insulating composites prepared by BN and PI was summarized, and the effects of fillers size, filler treatment, and composite f...