Design and preparation structure/function integrated polymer composites with high thermal conductivities and ideal mechanical properties have attracted widespread attention. Nanoscale graphene were employed to fabricate the thermal-structural integration graphene/carbon fiber/copoly (phthalazinone ether sulfone ketone) composites via solution prepreg followed by hotcompression method. The thermal conductivity (λ) and mechanical properties were all improved with the formation of graphene thermally conductive selfreinforced network. The thermal conductivity was increased to 1.057 W/(m K) by 89.8% higher than the pure carbon fiber composites. Moreover, the flexural strength (1878 MPa), compressive strength (907 MPa) and interlaminar shear strength (66 MPa) of graphene-modified composites improved with 22.1%, 51.9%, and 24.5% than the conventional composites, respectively. Dynamic mechanical analysis has proved that graphene/carbon fiber/copoly (phthalazinone ether sulfone ketone) composites had excellent high temperature mechanical properties, which presented a great potential for structure/ function integrated composites. K E Y W O R D Scarbon fiber composite, structure/function integrated, thermal conductivity | INTRODUCTIONCarbon fiber (CF) reinforced thermoplastic composites (CFRTPs) have become the crucial materials via excellent performance in multiple fields. The optimized combination of high-performance CF and various resin matrix (polyetherimide, polyphenylene sulfide, polyetherketoneketone, etc.) can meet the development requirements of aerospace, military, general aviation, satellite, energy, automobile and electronics industry for advanced materials with lightweight, high strength, high impact resistance and high temperature resistance. [1][2][3][4][5][6] As a new type of high-performance engineering plastic, copoly (phthalazinone ether sulfone ketone)

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