Aiming at the development and evolution of the interface disturbance wave, this article uses a liquid film thickness measurement sensor based on near-infrared absorption and attenuation technology to conduct 154 sets of interface disturbance wave measurement experiments on an adjustable and medium pressure wet gas test facility. And the methods of recursive quantitative analysis are utilized to extract four characteristic parameters of the liquid film time sequence signal including the certainty. The wavelet analysis is combined to study the evolution law of the disturbance wave at the gas-liquid two-phase flow interface. Results show that with the increase of pipe pressure, the deterministic value of interface disturbance wave remains around 1, and the recursive entropy value decreases from 4. 5 to 3, which indicate that the order of interface wave motion is enhanced. The ratio value suddenly increases from 1 to 2. 5, and the recursive ratio value decreases from 0. 5 to 0. 3, which indicate that the periodicity of disturbance wave is significantly enhanced, and the transition from unsteady state to steady state. In fully annular flow, with the increase of pipe pressure, the two-phase interface is dominated by regular ripple waves. The certainty value of the interface wave decreases from 1 to 0. 6, the recursive entropy value decreasing from 3 to 2, the ratio value suddenly increases from 2. 5 to 15, and the recursion rate value dropping from 0. 3 to 0. 1.