The standards of GB/T 7305-2003 and SH/T 0191-1992 only evaluate the demulsibility of turbine oil under the condition of oilwater mixing in one time and fixed proportion of oil and water,but the demulsibility change of turbine oil is not considered under the condition of oilwater mixing in several times and changed proportion of oil and water.According to the method of standards of GB/T 7305-2003 and SH/T 0191-1992,by adjusting the times of oilwater mixing,the demulsification change of the turbine oil was investigated under condition of oilwater continuous mixing.Results show that the demulsibility of turbine oil is reduced when oilwater continuous mixing.The test results by GB/T 7305-2003 show that along with the increasing of oilwater ratio and times of oilwater mixing,the demulsibility of turbine oil is reduced obviously,and with the test by SH/T 01911992,the demulsification change is not obvious,but it tends to reduce when oilwater ratio is very large.Thereby when turbine oilwater continuous mixing,there is a certain difference between the test results of laboratory and the practical performance of turbine oil,and the test results of demulsification are also different from different test methods.In order to evaluate the demulsibility of turbine oil precisely and promptly,it is necessary to establish a new test method. 