Abstract: Three types of plant fibers (hazelnut shell,coconut shell,and rice-husk) were separately added into polyvinyl chloride (PVC) as the fillers to prepare three types of husk's fibers/PVC composites through the extrusion molding process.The components of the plant fibers were analyzed and the mechanical property and water absorbency capability of the composites were tested.The FTIR spectra analysis and TG-DSC analysis was conducted on the husk's fibers/PVC composites.The section microstructures of the composites were observed by SEM.The results show that the rice-husk is the richest in cellulose,and rice-husk/PVC composite has the best binding interface and mechanical properties with bending strength at 69.79 MPa,which is 4.34% and 24.87% higher than that of the coconut shell/PVC and the hazelnut shell/PVC composites,respectively.The water absorption in 24 h of the comoposites are all below 1%,and the coconut shell/PVC composite has the lowest water absorption rate among them,which is 0.600 5% in 24h,while the hazelnut shell/PVC composite has the best heat stability.The mechanical property and water absorbency capability of husk's fibers/PVC composites are all up to GB/T 24137-2009 and GB/T 24508-2009,respectively.