A flat-panel display backlight module based on blue laser diode is designed, which is composed of light guide module and light guide plate (LGP). The scheme of keeping apart the light guide module and LGP is used in the process of designing optimization. A light guide module whose horizontal part distributes regularly, vertical part distributes unanimously in the transmission process and LGP network with uniform output light distribution are designed. The LGP sample is produced by adopting the method of laser dotting. Theoretical simulation shows that the intensity of illumination uniformity can reach 89.02%, and the average value of corner can reach 102.74%, for the whole module. And experiment measurement shows that the intensity of illumination uniformity can reach 79.61%, the average value of corner can reach 100.10%. The structure of this backlight module is simple, and it can offer back lighting for the liquid crystal display.