In this study, biocomposites were prepared by using an unsaturated polyester and Luong bamboo fibers (BFs). Fibers separated from bamboo body by mechanical method had size distribution mainly between 0.24 and 0.40mm diameter and 1-2.5cm length. Some factors having effect on properties of materials, such as fiber content, type, and concentration of coupling agents were also studied. As a result, composite materials showed good properties at 90 phr of BFs that were modified by 0.7% vinyl-functional silane coupling agent.