Abstract: The Cold pressed Sesame oil was used as material, and the effects of parameters of citric acid degumming on degumming efficiency were researched.On the basis of the single factor experiment, the conditions of citric acid degumming were optimized by orthogonal experiment. The best conditions as follows: temperature60℃, citric acid dosage 5.0g /kg, water dosage 2.5%, time 40 min.Under the best conditions, phosphorus content of the degummed oil was 54.05 mg /kg, degumming rate reached 72.90%.Except for the POV of degummed Sesame oil rised, its color obviously shallowed, AV and Unsaponifiable matter content lowed.