Lacquerseedshellfibers(LSSF)reinforcedHDPE/UHMWPEcompositeswere prepared by melt blending and injection molding technique.The effects of LS SF content on the fluidity and tribological properties of the materials were studied.The morphologies of wear surfaces were examined with the Scanning Electron Microscope(SEM) .The results showed that the LS SF could greatly decrease the melt viscosity of the composites during processing， and increase the melt flowrate.The melt flowrate was improved 38.4 times compared to the HDPE/UHMWPEcompositeswhenthecontentof added fiberwas 20wt%.The friction coefficients of the composites were all lower than that of HDPE/UH-MW PE composites， and the wear loss was decreased.The friction coefficient and wear vol-ume were reduced by up to 60%and 72.9%by adding the fiber content of 15%.TheSE M photographs of wears cars of composites clearly indicated that the abrasive wear and ad he-sive wear were the primary wear mechanisms.