Addressing the challenging measurement of oil-gas two-phase parameters in the return oil pipeline of an aeroengine lubrication system, the cross-sectional phase fraction measurement is achieved using electrical capacitance tomography technology,and the flow pattern is regularized through a rectifier to enhance measurement accuracy, at the same time,the venturi technology is utilized to achieve total flow measurement, ultimately leading to the measurement of gas-liquid two-phase flow. A calibration device for oil-gas two-phase measurement has been set up on the field test bench for comparative testing of the measurement system. The results indicate that the measurement accuracies are respectively better than 7.26%FS and 6.56%FS within the range of liquid phase volume flow rate of 30L/min and gas phase mass flow rate of 25g/s, effectively meeting the requirements of field testing. The research presented in this paper plays a crucial supporting role in the design of lubrication systems in the aeroengine field.