Abstract: Taking two kinds of constituent siliconized graphite composites prepared by reactive molten infiltration with different isostatic pressures (40 MPa and 70 MPa) and commercially purchased Russian-made siliconized graphite composites as research objects, the phase composition, microstructure and friction and wear properties under water lubrication conditions of three kinds of constituent siliconized graphite composites were studied. The results show that the phases of the siliconized graphite composites were composed of carbon phase, silicon carbide phase and silicon phase, which were distributed as a three-dimensional network embedded. When the carbon phase content was relatively low and the silicon graphite content was relatively high, friction coefficient of siliconized graphite composites increased with the load; when the carbon phase content was relatively high and silicon carbide content was relatively low, the friction coefficient increased first and then decreased with the load. The wear loss of different constituent siliconized graphite composites was extremely low, and the siliconized graphite composites had excellent wear resistance. The wear mechanism was mainly abrasive wear.