The effect of impacting velocity on erosion wear resistance of 35CrMo steel under stress was studied.Under the simulated condition of pipe manifold under 105 MPa stress,a selfmade jet erosion wear experimental device was used for erosion test of 35CrMo steel samples with jet fluid carried sands at the erosion angle of 30°.The effect of impacting velocity of the jet fluid carried sands on erosion wear was studied,and the scanning electron microscope (SEM) was used to analyze surface condition of samples after experiments.The results show that,with the increasing of impact velocity with the constant flow under 105 MPa stress and erosion angle of 30°,the erosion rate 35CrMo steel is increased exponentially.The erosion depth is increased as impact velocity increases.The impact wear mechanism of 35CrMo at 30° is the same under different impact velocity,mainly for cutting wear.