Abstract:When it is cold winter in the northern China, the temperature of water is very low. Low temperature is the main reason of the worse treatment of oil wastewater. In cold winter when the temperature is lowered to around 4°C, the effect of biological treatment of sewage is poor and hard to target the problem of reach a set standard of outing water. Use of microbiology to deal with oil pollution is one of the most effective, the most secure and the most thorough method. So the article from the microbiological point of view to study, isolated from nature world, screening to eight low-temperature grease which can grow under 5°C and degradation of sewage bacteria.