Abstract: In this work, the pipes based on the polypropylene (PP)/carbon fiber (CF) composites were prepared by melt extrusion using different compatibilizers. The effects of CF lengths and contents and compatibilizer types on the mechanical properties, longitudinal retraction rate and blasting strength of the pipes were investigated by means of a long-term pressure test instrument, computer-controlled electronic universal test machine, combined digital display and scanning electron microscope. The results indicated that the introduction of CF as a high modulus and low retraction filler reduced the overall longitudinal shrinkage of PP/CF composite pipes and enhanced the burst strength of the pipes. Meanwhile, the addition of compatibilizer improved the mechanical properties of pipes significantly.