Abstract: 2.5D stuffer warp reinforced composites were prepared by combining the three-dimensional weaving technology and resin transfer molding (RTM) process in which the carbon fiber is domestic manufactured with different sizing amounts. The weaving damage condition of warp, stuffer warp and weft in performs of different kinds of sizing amounts were investigated by using hairiness testing, multifilament yarns tensile tests and SEM. The results show that carbon fiber woven damage rates decrease as the sizing amount increase. The order of yarn damage rates in 2.5D stuffer warp reinforced composites is weft, warp, stuffer warp. Tensile property test results of composites show that the 2.5D stuffer warp reinforced composites achieve optimal performance when the sizing amount of domestic carbon fiber is come to 2.01%.