Abstract: A series of experiments were conducted on 7085 aluminum alloy under various stress ratios. The finite element model of the 7085 aluminum alloy was established using a coupled simulation approach combining ABAQUS and FRANC3D. This study analyzed the influence of the stress ratio on the fatigue crack growth rate of the 7085 aluminum alloy and predicted its service life through finite element simulation. The results indicate that the stress ratio significantly affects the fatigue crack growth rate. Specifically, under high stress ratios, the elongation of the 7085 aluminum alloy is greater than that observed under low stress ratios. Furthermore, the finite element simulations of crack propagation rate, service life, and fatigue life prediction exhibit excellent consistency with experimental data, thereby validating the applicability of this simulation method for predicting crack propagation and service life in 7085 aluminum alloy.