In order to study the influence of different working conditions on the wear characteristics of cylinder liners at the top dead center position, cylinder pressure characteristic curves were obtained through engine bench tests under different working conditions, and cylinder liner piston ring wear experiments were conducted under different pressures based on cylinder pressure changes. Investigated the progression of friction coefficient, wear volume, and wear mechanisms of the cylinder liner piston ring under varying pressures. The findings indicate that both the friction coefficient and wear volume escalate as pressure intensifies; at reduced pressures, the wear process of the cylinder liner piston ring is predominantly marked by plastic deformation and minimal flaking. With an increase in pressure, the wear mechanism transitions towards delamination, and can lead to more severe wear such as block peeling; furthermore, the Archard model was applied to assess the wear of the cylinder liner, revealing a linear correlation between the wear coefficient of the cylinder liner piston ring and pressure. This research offers a theoretical foundation and empirical evidence for evaluating the wear of cylinder liner piston rings.