Poly( lactic acid)( PLA) was used as matrix,and two kinds of typical regenerated cellulose fiber,viscose fiber and Lyocell fiber,were used as reinforcing fiber,respectively,and then cellulose fiber/PLA composites were prepared by melt compounding and followed by injection molding,and the properties of viscose/PLA and Lyocell/PLA composites were compared. The results show that the crystallinity,mechanical properties and Vicat softening temperature of composites can be improved efficiently by the reinforcemen...