Abstract: The influence of laser shock of Ni-Co sample on plasticity deformation,hardness,stress and life is studied experimentally and simulated by ABAQUS.The results indicate that laser shock can make shock area produce residual pressure stress and hardness of shock area be enhanced.By test on an automobile,the average life of the impacted spark plug is testified to be enhanced by almost one times than the crude spark plug.The results prove that the laser impact strengthening technology is a prospective measure for enhancing the lifespan of the spark plug.