Two parametric flow measurement in air-oil two-phase flow plays an important role in the oil or gas field production, many scholars all over the world are now devoting themselves to the study of this measurement technology.The segmental orifice has a marvellous function for the metering of the fluid with some impurities, and is well suitable for measuring gas-oil mixture in the oil or gas field.This paper reviews a measurement of air-oil mixlure flow by the collection of Rossmeter and segmantal orifices, and treats the experimental data with the separated flow momcniun theoretical wodel and improved energy model. The test shows that the root mean square fractional deviations are less than 10%.Finally, the authors arrive at the conclusion. to treat the experiment data for an air-oil mixture, the momentun mcdel is much better than the improved energy model.