By means of selective enrichment cultivation, domestication, streaking cultivation and purification, four COD degrading strains, numbered 1, 2, 3 and 4 respectively, have been isolated and separated from slaughterhouse wastewater in a meat product Co., Ltd., Hunan Province. A preliminary separation has been made of the four domesticated strains of COD-degrading bacteria, and the potassium permanganate method has been adopted to determine the COD degradation rate of strains, with three of them reaching the highest rate of 11.30%. After observing the morphological characteristics of No. 3 strain and Gram staining test, it has been preliminarily identified that No. 3 strain proves to be Salinococcus. A research has been conducted on the characteristics of culture temperature, pH value, peptone concentration and yeast extract concentration, with the results of single factor optimization showing that the optimum growth temperature of No. 3 strain will be 37 ℃, with the optimum pH value 6, the concentration of peptone in culture medium 1.5%, and the yeast extract concentration 0.8%.