The work aims to grasp law of influence of laser shock processing temperature on processing effect. The influence of laser shock processing temperature on residual stress and plastic deformation of TC17 titanium alloy was preliminarily studied in the method of finite element simulation. With the increase of temperature, the residual stress firstly increased and then decreased. At the temperature of 200 ℃, the residual stress on the surface and in depth direction was the maximum, the maximum residual stress of material is ?238 MPa. With the increase of temperature, the plastic deformation firstly increased and then decreased. At the temperature of 200 ℃, the plastic deformation reached the maximum. Different shock order would affect flow direction of material. Later-impacting laser would cause the material to complete pit movement, which would affect surface morphology of the material. Difference in maximum residual stress between simulation analysis and confirmatory experiment was less than 5%, thus accuracy of the simulation results was proved from another side. Temperature is an important factor that affects effect of laser shock processing. For TC17 titanium alloy, the best processing effect is achieved at 200 ℃ for warm laser shock processing, and simulation method provides a new idea for laser shock processing simulation.