Abstract: kW 3GQ 2/70 high pressure water jet cleaning device was used to evaluate the erosion wear behavior of a general hydraulic concrete with or without steel fiber. The eroded worn surfaces of the concrete samples were observed with a scanning electron microscope, while the erosion wear mass loss of the samples determined with a procession balance. It has been found that the hydraulic concretes experienced severe erosion wear as impacted with high speed water jet containing sand. The erosion wear of the concrete is characterized by the cutting action of the hard particles along horizontal direction and that along vertical direction. The initiation and propagation of cracks near the defects in the concretes may lead to brittle fracture. The steel fiber is effective to increase the erosion wear resistance of the hydraulic concrete impacted by high speed water jet at a small angle.