Abstract: For the important hydraulic parameters to design pulsed sieve column, dispersed drop size and drop velocity have important research value. The experiment was carried out in a 38 mm inner diameter standard pulse sieve column. The study based on two-phase: water was set as the continuous phase, while the pure kerosene as the dispersed phase. They went on with a dual optical probe technology to explore the influence of operation data, such as dispersed phase superficial velocity, continuous phase superficial velocity and pulse intensity on dispersed drop size. In the experiment, a measurement system for two-phase flow could recognize water and kerosene well in the liquid-liquid two-phase flow. Experimental results prove the feasibility of the application of optical probe technology to the liquid-liquid two-phase flow.