Effects of natural organic matters(NOM) and hydrated metal oxides(HMO) in sediments on the anaerobic degradation of γ-666, p,p-DDT and HCB were investigated by means of removing NOM and HMO in Liaohe River sediments sequentially. The results showed that the anaerobic degradation of γ-666, p,p-DDT and HCB followed pseudo-first-order kinetics in different sediments; But, the extents and rates of degradation were different, even the other conditions remained the same. Anaerobic degradation rates of γ-666, p,p-DDT and HCB were 0.020 d-1, 0.009 d-1 and 0.035 month-1 respectively for the sediments without additional carbon resources. However, with addition of carbon resources, the anaerobic degradation rates of γ-666, p, p-DDT and HCB were 0.071d-1, 0.054d-1 and 0.088 month-1 in the original sediments respectively. After removing NOM, the rates were decreased to 0.047 d-1, 0.037 d-1 and 0.066 month-1; in the sediments removed NOM and HMO, the rates were increased to 0.067d-1, 0.059 d-1 and 0.086 month-1. These results indicated that NOM in the sediments accelerated the anaerobic degradation of γ-666, p,p-DDT and HCB; the HMO inhibited the anaerobic degradation of γ-666, p,p-DDT and HCB.