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The biodegradable composite material was prepared by injection molding with PHBV as matrix and microcrystalline cellulose and waste paper fiber as reinforcements. The iffects of MCC with different mass fraction and waste paper fiber with different mass fraction on the mechanica properties, water absorption and interfacial properties of the composites were investigated. The results show that the mechanical properties of the composites after adding MCC have been improved and the mechanical properties of the composites are the best when the mass fraction of MCC is 3%. And the composite material after blending and filling has the best combination mechanical properties when the mass fraction of waste paper is 10%. The water absorbency of composites increases with the increase of fiber content in waste paper. Scanning electron microscopy analysis shows that the compatibility of MCC with P-HBV interface is better and the interfacial properties of blended waste paper fibers decrease. [ABSTRACT FROM AUTHOR]