HVOF ( high velocity oxygen fuel) sprayed WC cermet coating possess high hardness, high bonding strength and nearly full-density, which are the candidates of EHC(electrolytic hard chromium). In the present paper, the research status quo of the influence of HVOF sprayed WC coating on the fatigue life of the substrate was summarized and the reasons of crack invitation and fatigue life decrease were also analyzed. The factors affecting the fatigue life are as follows: the difference between the coating and the substrate in properties, the defects introduced by grit blasting, residual stress and coating gradient design, shot peening replacing grit blasting and could be adopted in order to improve or increase the fatigue life of substrate.