Abstract: The intensity distribution and the divergence of the laser diode (LD) output beam are variable with the different operating current and individual differences. The design of conventional diffractive optical element(DOE) to shape LD beam depends on the intensity distribution of the LD input and output beam, so the tolerance for the input LD beam is very small. A DOE array was put forward to shape the LD beam into three rectangles. It consisted of many DOE units, and each DOE unit could shape the corresponding small segment wavefront into needed output shapes, and all light diffracted by all DOE units was super-positioned on the output plane. Using the above DOE array laser shaped method, three rectangles intensity distribution were realized from Gaussian beam with the diffraction efficiency of 90.5% and the uniformity of 96%. When the half divergence angle of the LD varied from 2to 16in slow and fast axis direction respectively, the diffraction efficiency maintain was approximate 90% and its uniformity was more than 95%. When the defocus of the lens to collimate LD beam varied from -16 m to 16 m,numerical experiments indicate that uniformity and the diffraction efficiency of the shaped beam by the DOE array do not vary. The stability of the LD beam shaping system is improved.