Abstract: The double-cone flowmeters with equivalent diameter ratio 0.424 and 0.586 are designed. Experimental study on the parameter measurement is carried out on the multi-phase flow facility. The measurement model is established for the gas volume fraction through analysis of characteristic values obtained from time serial signals of the differential pressure measured by the meters. On the basis of the gas volume fraction model, the flowrate measurement models are established in terms of linear relationship between the Lockhart-Martinelli constant and the quasi-ration of the gas flowrate. A series of experiments are conducted on the facility of the air-water two phase flow. The experimental results show that the gas volume fraction measurement model provides good performance in the given measurement range with the error within 5%. The measurement errors of the total flowrate and liquid flowrate are within 6% by using the modified Murdock model. The measurement error of the gas flowrate is relatively larger possibly due to the small gas mass fraction.