Abstract: The principle of the three dimensional fracture analysis software FRANCE3D（Fracture Analysis Code in 3Dimensions） on fatigue crack growth is introduced,and the actual surface crack growth on overlay of the hot-wall hydrogenation reactor was analyzed by FRANCE3D.The results of numerical simula-tion were compared with that of the experiment data.The results show that the surface crack growth path ob-tained by numerical simulation is same to that by experiment basically;and compared with the result of ex-periment,the crack growth rate got by FRANC3D is more conservative than the experimental data in the ser-vice-life of hydrogenation reactor.