Abstract: In this paper, the effects of carhou contents and distrilmtion form on the mechanical, thermal,wear proporrties and fracture motphologies of polysnlfoue (PSF) composites have been studied.With increasing of short-CF content,the imapct strength of PSF slightly dec reases,but tensile and flexible strength increase.In the long-CF/PSF composite system these strengths increase a more prononncedlr than in short-CF/PSF composite.The interlaminar shear strength of long-CF/PSF composite is about 80% of tensile strength of PSF. CF/PSF composites have much better wear yroperties and higher thermal deformation temperature with increasinh of carbon fiber contents.Failure in CF/PSF composite appears in form of dehonding between fiber and resin.