Abstract: To improve the interfacial compatibility between wood fiber and polypropylene as well as the toughness of wood fiber-polypropylene composites,maleic anhydride grafted polypropylene(PP-g-MAH) and maleic anhydride grafted styrene-ethylene-butadiene-styrene copolymer(SEBS-g-MAH) were used as modifiers.The static mechanical property test showed that the mechanical properties of wood fiber-polypropylene composites to which PP-g-MAH or SEBS-g-MAH was added were improved.The composites added PP-g-MAH or SEBS-g-MAH had a better interfacial compatibility than the unmodified ones,and this was verified by scanning electron microscope(SEM) observation and dynamic mechanical analysis(DMA).The mechanical properties of the composites were significantly improved because of the good interfacial adhesion between wood fiber and polypropylene when PP-g-MAH and SEBS-g-MAH were added.