Abstract: Poly(2,6-dimethy-1,4-phenylene oxide)/polyamide 6/styrene ethylene butadine styrene copolymer/carbon fiber(PPO/PA6/SEBS/CF) composities were compatibilized by maleic anhydride (MAH) grafted PPO (PPO-g-MAH) and reinforced by carbon fiber (CF) via melt extrusion.CF was mixed through the side chipper spout，the content of CF can be controled by alter the speed of screw．Dynamic Thermal Mechanical Analysis（DMA），Capillary Rheometer and Mechanical Properties Testing were used to investigate the effect of CF content on thermal mechanical properties，rheological behaviors and mechanical properties of composities．Compared with the composities reinforced by glass fiber (GF) through Scanning Electron Microscopy (SEM) and Mechanical Properties Testing，the mechanical properties of composities and the adhesion of polymers to CF is better than GF．