To have a better understanding of fretting wear for titanium alloys, the effect of wear particles distribution on coefficient of friction, wear volume, surface topography and damage mechanisms at various displacement amplitudes was investigated. The results show that the displacement amplitude has a significant influence on the distribution of the fretting wear particles. The "flake-like" delamination formed by the central adhesive tear is stacked into a "ridge" in a direction perpendicular to the fretting at a relatively low fretting-amplitude. At a medium amplitude, the debris particles are scattered on the contact surface. When the amplitude is even increased, "cluster-like" debris are accumulated into a "ridge" parallel to the direction of the fretting. The various distribution of the wear particles leads to the change in the wear mechanisms from the adhesion to abrasion with slight adhesion, and finally to the abrasion accompanied with the oxidative wear. © 2020, Science Press. All right reserved