In the fabricating of CF/PPS composite by traditional hot-press, the PPS melt with high viscosity is difficult to be forced into the carbon fiber bundle to get stable and high quality products. On the other hand, the fibers of carbon fiber blended PPS granules, which are commercially available for injection molding, tend to break into short segments due to the mixed granulation process, reducing the strengthening effect. The purpose of this study is to tried to fabricate hot-press and injection molding CF/PPS composites from CF/PPS chips prepared via the slurry prepreg method. We identified appropriate processing conditions, then evaluated the mechanical properties of composites fabricated from CF/PPS slurry prepreg chips via tensile, bending, and impact tests, and compared to those of composites made from commercially available CF/PPS granules. In addition, the internal structure of the material and the fracture surface after the tests were analyzed via microscopy to determine the strengthening mechanism of the material structure. Experimental results show that when the carbon fiber content of CF/PPS prepreg chips is over 55 wt.%, the PPS matrix do not flow easily to fill the void space in the material sufficiently in the hot-press forming process. Good welding between prepreg chips with fiber content of 20 wt.% can be expected when the hot-pressing temperature is elevated to 310 �Ž. Excessive fiber content during injection molding will result in a low fluidity of the material. The composite specimens injection molded with prepreg chips of fiber content 15 wt.% were tested, the tensile strength increased by 60%, the bending strength increased by 37%, and the impact strength increased by 34%. The tensile strength and impact strength of the composites made from prepreg chips with a carbon fiber content of 15 wt.% are higher than those of the composites made from commercially available 30 wt.% CF/PPS mixing granules, which means that composites via the slurry prepreg