To develop the new polymeric tribomaterials for mechanical sliding parts such as bearing, cum, gear and seal, we experimentally investigate the mechanical and tribological properties of glass fiber (GF) reinforced bismaleimide-based polyimide (PI) composites. In this study, the thermosetting type commercially bismaleimide-based PI was used as a matrix polymer for composite materials. GF/PI composites with the GF content of 5, 10, 15 and 20 vol. % were prepared. These GF/PI composites were manufactured by defibration of fiber, pre-forming, dry mixing, hot press molding (compression-molded) and heat treatment. Mechanical properties such as Barcol hardness, bending and tribological properties using ring-on-plate type sliding wear testing were evaluated. It was found that Barcol hardness, bending strength and bending modulus of GF/PI composites improve with increasing GF content. On the other hand, the influence of fiber content on the tribological properties, namely frictional coefficient, specific wear rate, and limiting pv value of GF/PI composites differed for each tribological properties. This may be attributed to change in the wear mechanism of GF/PI composites according to fiber content.