Abstract: The tangential fretting wear tests of 690 alloy tube/405 stainless steel were carried by a self-designed fretting wear test rig. The effect of displacement (15 μm, 30 μm, 80 μm, 200 μm) on fretting wear characteristics has been investigated. With the increase of amplitude, fretting wear tests were running in partial slip regime (15 μm), mixed slip regime (30 μm) and gross slip regime (80 μm and 200 μm), respectively. The friction coefficient of partial slip regime was lower associated with slight damage, while the friction coefficient of mixed slip regime and gross slip regime were relatively higher. Additionally, the steady values of mixed slip regime and gross slip regime were almost same. Generally, with the increasing displacement, the width of wear scar and wear volume increased. The main wear mechanisms of partial slip regime were adhesion wear and delamination, while the main wear mechanisms of mixed slip regime was delamination. And the main wear mechanisms of gross slip regime were delamination and abrasive wear.