The test investigated the impact fretting wear behaviour of 304 stainless steel thin-walled tube under different support interface (angle) and tube length through a new impact wear tester. The contact interface characteristics and damage behavior of the tubes was inspect during the impact fretting progress. The results showed that when the support angle increasing, the value of maximum deflection and contact time increased, but the contact peak force, energy absorption, and wear damage degree decreased. The rise of length leaded to reduce the deflection and contact time, meanwhile an increase in contact force, energy absorption ratio and serious damage degree. Through analyzing the morphologies and profiles of the wear scars, the wear mechanisms of impact fretting wear of 304 stainless steel thin wall tube was contact fatigue spalling.