Based on the computer generated holography(CGH) and the diffraction theory with Conflans Wo fee diffraction approximation,the gratings to generate different ordered Bessel-like beams were designed.By means of intensity distribution simulation and analysis,the distribution patterns influenced by exponent number of Bessel-like beam,propagation distance,and radius of beam were obtained.The results proved that the parameters of the obtained hollow beams,like dark spot size,width of ring beam and bea...