In order to study the effect of yarn structure and morphology on the tribological properties of fabric composites,three kinds of aramid yarns with different structure and morphology were prepared from para-aramid fiber,namely filament parallel yarn,filament twisted yarn and short fiber twisted yarn.Three kinds of aramid/PTFE fabric composites were prepared by the same process.The tribological properties of the composites were evaluated by multi-specimen test machine.The structure and morphology,mechanical properties and tribological properties of aramid/PTFE hybrid fabrics and corresponding composites were analyzed.The experimental results show that the structure and morphology of aramid yarn can affect the tribological properties of aramid/PTFE fabric composites.This is because the structure and morphology of aramid yarn directly change the yarn strength,the yarn pull-out strength,and the interfacial bonding force with the resin.The abrasion resistance of the hybrid fabrics varies with wear conditions.When the load is relatively low,the wear rate of aramid short fiber twisted yarn/PTFE fabric composite is lower,while when the load is higher,the abrasion resistance of aramid filament twisted yarn/PTFE fabric composite is better.