This paper presents a thorough study of the wave-plate gas-liquid separators. The resistance curve has been obtained by the method of combining numerical simulation and experimental research. The separation efficiency curve under rated conditions for the droplet with different particle diameters has been obtained by using stochastic trajectory model. This can provide a new method for the research of wave-plate gas-liquid separator. The results obtained here may provide some new theoretical guidance for the development and optimal design of wave-plate gas-liquid separator.