Abstract ：Injection sample of bamboo powder reinforced PVC composites was prepared with bamboo fiber, PVC powder, impact modifier, coupling agent, foaming agent and so on after melt mixing in twin screw extruder. The effects of bamboo fiber content, impact modifier loading, types of coupling agent and foaming agent on the mechanical properties as well as microstructure via SEM were investigated. The result showed that: Bamboo fiber reinforced the mechanical performance within certain filling ranges, and it turned to fall after the filling content exceeded 20%. The addition of CPE impact modifier introduced rubber state polymer structure, thus improved the toughness a lot. Silane coupling agent performed better than MAH-g-PP, EVA, aluminate coupling agent, titanate coupling agent in sequence in improving the effect of the composites. Composites foaming agent was superior to monocomponent one. The best foaming effect was obtained when AC : Urea mass ratio was 1:1 with content at 1.0%.