In order to improve the fluidity of wax⁃containing crude oil and ensure the normal operation of the oil pipeline, this study took paraffin as the only carbon source and selected a strain of hydrocarbon⁃cracking bacteria from the soil polluted by petroleum. After the growth conditions of the bacteria were optimized, the performance of the metabolites of the hydrolytic bacteria was studied, and the effect of the bacteria on the wax removal and viscosity reduction of Daqing crude oil was investigated. From different experimental perspectives, it was proved that the bacteria could emulsify the wax⁃containing crude oil of Daqing, reduce the surface tension of oil and water, and also have a good effect on the wax removal and viscosity reduction. The results show that the wax content of crude oil is reduced by 54%, the wax evolution point is reduced 2 ℃, the related abnormal pointis reduced by 3 ℃, the viscos