Bamboo fiber reinforced polylactic acid composites was prepared by injection molding technology with polylactic acid and the bamboo fiber modified with 1.5% isocyanate (MDI) interfacial modifier. Effect of BF mass fraction on interface, mechanical property, water absorption and thermal property of composites were investigated. The results showed that tensile strength, impact strength, storage modulus and thermal stability of composites first increased and then decreased with increase of BF mass fraction, 24h water absorption gradually increased, loss factor gradually increased. When BF mass fr...