This paper is intended to make a study of the measurement of air-oil mixture flow by the collection of Ross meter and Sharp-odgeds orifice, and treat with experimental data using the separated flow momentum theoretical model and the improved energy model. In the range of this test, the root mean square fractional deviations are less than 10%. The study provides the following direct experimental evidence: To treat with experiment data by using momentum model are keller than improved energy model for an air-oil mixture.