Output of oil, water, and gas of oil wells are the most basic production parameters for oilfields to increase revenue and reduce expenditures, and realize intensive and digital production. However, due to different nature of the crude oil of each well, there are huge differences in fluid production, gas production, separated water , as well as the irregularities of oil well fluids and other complex factors, thus it is difficult to find a simple operation with strong adaptability, and measurement accuracy at home and abroad, which severely restrict improvement of the information construction and intensive management of the oil field. Our credible three-phase oil measurement technology is for this problem, especially for those oil wells that enter the high water period or high gas content.