The temperature signal of oil/water two-phase flow is disturbed by noises from external interference which results in difficulty in distinguishing performance of oil/water and a small measuring range for oil holdup.In order to solve the problem

a new signal processing method based on the multiwavelet neighboring coefficient method was used.Compared with traditional threshold de-noising based on multiwavelet and vector threshold de-noising

the neighboring coefficient method can deal with the correlativity among the transformation coefficients and ensure better de-noising effect.Processing of a large amount of experiment data of oil/water have revealed that measurement of oil holdup based on voltage amplitude transform of thermocouple gave a measuring range of 3%—70% oil holdup.The mathematical expression between voltage ampitude fluctuation and oil holdup was obtained

and the measurement error of oil holdup was 7.1%.