In order to study the effect of dispersed phase morphology on the mechanical and tribological properties of blends,PBT/HDPE blends were used as the research object,and the blends with fiber structure as dispersed phase were prepared by tensile traction during extrusion.By controlling the injection molding temperature and adjusting the different morphology of PBT dispersed phase,the effect of PBT morphology on tribological properties and wear resistance mechanism were studied.By adding lubricating particles multi-walled carbon nanotubes(MWCNTs)into the dispersed phase,the effect of the dispersion morphology of MWCNTs on the friction and wear properties of the blends was discussed.The results show that when the injection temperature is 200 ℃,the dispersed phase of PBT is mainly fibrous,and the added MWCNTs are mainly dispersed in the PBT phase.When the injection temperature is 240 ℃,the PBT is spherical dispersed in HDPE matrix,and some MWCNTs are migrated to the phase interface and some are embedded in HDPE matrix.The tensile result show that the tensile strength of PBT/HDPE blends with fibrous dispersed phase is higher than that with spherical dispersed phase,and the elongation at break of the blends is significantly increased after the addition of MWCNTs.The tribological properties of MWCNTs/PBT/HDPE blends are closely dependent on the dispersed phase morphology and the wear condition.At low contact load and low sliding speed,the friction and wear performance of blends with spherical phase morphology is deteriorated by the addition of MWCNTs.MWCNTs can’t play the role of lubrication and wear reduction until they are released from PBT at high contact load or high sliding speed.