The reaction temperature,enzyme dosage and water dosage were the most important factors during the degumming of iron walnut oil with phospholipase C found by sample test. Based on single factor tests,the optimization conditions for degumming of iron walnut oil with phospholipase C by response surface method(RSM) were performed.The optimal conditions were reaction temperature 46℃,enzyme dosage 45 m L/kg,water dosage 31 m L/kg. Under these optimal conditions,the residual phospholipid content in the degummed iron walnut oil decreased to 20.73 m...