An anaerobic bacterium strain isolated from activated sludge showed a strong ecological effect on the degradation of PM residues after inoculation into the PM-polluted soil. The results showed that in the pot experiment, the yellowing degree of rice leaves of bacterium treatment was remarkably slighter than that of control. The PM residues in rice of the bacterium treatment reduced by 82.2-100%. In the field experiment, no PM residues were found in rice of the bacterium treatments. But the PM content of control was over 0.065mg/kg, which exceeded the national standard of 0.05mg/kg.