Abstract: The composite materials were manufactured with the low melting point polyester(LMPET) and polypropylene(PP) as mattress and bamboo and flax fibers as reinforcement by nonwoven & heat molding technologies.Fuzzy evaluation method was undertaken to investigate the influence of fiber kind,fiber percentage by weight of the mattress and reinforcement on the mechanical properties of the composites. The fracture surfaces of composites were examined by scanning electron microscopy(SEM).The results reveal that the mechanical properties of the LMPET/40%bamboo fibers composite is the best with tensile strength(136.00 MPa) and(87.58 MPa) and flexural strength(534.00 MPa) and(470.00 MPa) in longitudinal and transverse directions respectively,outperforming the common engineering plastic.