Abstract: Impact wear and wear mechanism of high vanadium high speed steel against abrasive cobblestones of original dimension 25 mm were studied using impact wear tester WM-1 at rotation speed of 2840 r/min and simulated operating condition that wearing parts of crusher suffered. Results show that the wear resistance of high vanadium high speed steel is 3.1 times as high as that of high chromium cast iron. Under the condition of high speed impact of solid particle, scratching and spalling induced by cleavage fracture of carbide are the wear mechanism of high chromium cast iron. The impact wear of high vanadium high speed steel is an uninterrupted and repeated processing that the matrix was cut at first and then carbides flaked off.