Abstract: Aiming at the high permeability or low pressure oil layers in Huabei oilfield, conventional well washing will cause more effluent invading stratum, and it will take a long time for water content rate back to normal value. In view of the above problems, hot wax cleaning technology of the hollow rod without cutting production was applied. After the improving of well washing check valve, selecting the matching washing equipment, optimizing hot washing parameters, the hollow sucker rod and matched well washing check valve were put down into the paraffin section below. The heat well washing water through the rod surface to heat and melt rod pipe junction wax. The wax is transported to the measuring station with the output liquid, and then wax cleaning is finished to maintain the oil wells. This technology of short time, less water consumption, no water recovery period and no pollution formation, is a new process of high efficiency and energy saving.