To improve the frictional interface performance of traveling wave rotary ultrasonic motor (TRUM), the crosslink ultra-high-molecular-weight polyet hylene (UHMW-PE) composites are investigated. The composites are prepared by molten UHMW-PE resin mixed with methacrylic acid allyl ester (MAAAE) as sensitive crosslink initiator, carbon fiber and carbon nanotube as intensifier, MoS2 and graphite as frictional properties modifier, and then cross linked due to irradiation of Co60 γ ray at room temperature and pure N2 atmosphere. The Gel content analysis shows that it is rapidly increased with the increase of the γ ray irradiation dosage and MAAAE percentage. The composite provided by maximum Gel content is used as the rotor friction layer of TRUM-60. The test results of mechanical characteristic show that the motor with the new friction layer has good output performance: the stall torque is 1.4 N·m, the no-load speed is 225 r/min, and energy conversion efficiency is more than 25%. Furthermore，according to abrasion wear mass of TRUM-60 frictional material in 100 h, its estimated lifetime is longer than 8 000 h.