With compost, ZVI, and ZVI-compost as reaction media respectively, the feasibility and effectiveness of Cr-polluted groundwater by PRB were studied. The results showed that the reactor packed with ZVI-compost had a better performance than that with compost or ZVI alone; increasing the amount of compost ZVI could increase the removal effects; moreover the removal effects were little influenced by the time of composting; totle iron of effluent meet the requirement of standards for drinking water quality. 