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A technology of ultrasonic-electric united desalting and dewatenng of crude oil is studied.The ultrasonic setup is designed to form a standing-wave field,which is more efficient for agglomeration of water particles.The desalting and dewatering results of the ultrasonic-electric united process are compared with those of the electric process.For high salt-contenting crude oil(40-70 mg·L-1).the salt content is still above 10.0 mg·L-1after crude oil has been treated by two-stage electric desalting process in refinery,which cannot meet the need of refinery.Ultrasonic-electriC united process is a novel technology for treating the high salt-contenting oil.On the optimal operating conditions of the ultrasonic-electriC united process.the salt content of crude oil can be reduced from 67.5mg·L-1 to 3.97 mg·L-1 by one-stage ultrasonic-electric united process,and the water content falls below 0.3%(by volume).The results show that the ultrasonic-electric united process is more effective than the electriC process in high salt-contenting oil desalting.This technology should be usefuljn the refinery process.