Polylactide　(PLA)-based　wood　plastic　composites　(WPCs)　were　manufactured　to　investigate　the　effects　of　linear　low　density　polyethylene　(LLDPE)　on　the　resulting　composites,　which　were　fabricated　through　extrusion　blending　followed　by　injection　molding.　The　static　and　dynamic　mechanical,　and　thermal　properties　of　the　PLA-based　WPCs　were　tested　and　the　morphologies　of　the　cryofractured　surface　were　observed.　The　impact　toughness　and　interface　adhesion　of　the　PLA-based　WPCs　toughened　with　LLDPE　were　significantly　improved,　compared　with　their　unmodified　counterparts.　LLDPE　had　no　significant　effect　on　the　thermal　stability　of　the　PLA-based　WPCs　and　could　be　an　advisable　toughening　agent　for　the　PLA-based　WPCs.