This paper describes effects of discarded polyvinyl chloride(D PVC) content on physical and mechanical properties of wood partcle/plastic composite board.The results showed that modulus of rupture( MOR ),modulus of elasticity( MOE ),internal bond strength ( IB ) and thickness swelling( TS ) were all decreased with increasing of D PVC content.But loss tangent was increased and changed of surface roughness of the board took place.However,the properties can meet the requirement of the standard JIS A 5908 in many cases.It indicates that super composite board could be made with appropriate amount of D PVC.