Heavy metal pollution is not only damaging to the environment, plant growth, but also harming animal and human health through the food chain. The experimental environment in this paper was coastal sediment, the effects of the biomass and the absorption of heavy metal of Suaeda heteroptera kitagawa by Perinereis aibuhitensis activities were studied by the concentration of Cu and Pb in the body of Suaeda heteroptera kitagawa and the concentration of Cu and Pb, the available N, the available P, the total organic carbon and pH value in the sediment were measured. The results showed that the pH value of sediment was increased, the available N and the available P of sediment were raised and the biomass of the plant were improved in control groups by Perinereis aibuhitensis activities, the difference of fresh weight between with worm and without worm were 134.1. Perinereis aibuhitensis activities raised the concentrations of CaCl2-Cu and DTPA-Pb in the sediment, enhanced metal bioavailability and promoted the Cu and Pb absorption of Suaeda heteroptera kitagawa, the Cu concentrations and the Pb concentrations in the body of plant of under ground with worm was 1.14-2.89 times and 1.33-7.57 times that of without worm. Those provided the basis for improving the efficiency of phytoremediation of the heavy metal contaminated sediment.