In order to achieve high brightness fiber-coupled output of diode laser array, a simple but efficient system was designed. Firstly, the output beam from a laser diode arrays (LDA) was collimated by fast and slow axis collimation module. Secondly, the collimated beam in the slow axis was divided into 4 parts (any other amount of the divided parts if needed) by the beam-shaping set of two parallel plane mirrors, and then reordered in the fast axis. Finally, the shaped beams were focused into a fiber (600 μm, NA=0.37) by a focusing lens. The beam-shaping efficiency was 98.87％, and the total system efficiency was 77.2％. This beam-shaping system is simple but effective and useful.