After TC17 titanium alloy surface is processed by laser shock peening in two different changed energy parameters,the influence of changed energy parameters laser shock on fatigue life and propagation rate is analyzed by fatigue experiment,and then residual stress distribution on the surface of the specimen after laser shock is analyzed by X-ray residual stress equipment.The experimental results show that compared with untreated samples,the fatigue life of samples after laser shock peening in high numerical residual compressive stress respectively increases 2.14 times and 1.74 times.In the early of stable propagation,the fatigue crack propagation rate respectively decreases 21 % and 16 %.In the early stage of crack propagation,the propagation rate of LP-1 sample decreases obviously,and it has the maximum C′ value,the minimum m value;C′ value of LP-2 sample increases and m value decreased.Residual stress distribution is the main influence factor of fatigue crack propagation.Two schemes of laser shock peening both have inhibitory effect on fatigue crack propagation of TC17 titanium alloy.The laser energy increases with the increase of the residual compressive stress.The strengthening effect of laser shock on crack propagation is stronger in the early stage than that in the later stage.