Miscella was deacidified by zenith method, which has many advantages such as refining higher acid value oil, reducing the chances of neutral oil being saponified, reducing residual oil in soapstock and reducing production cost. Under the optimal deacidifying process conditions, the flow of miscella inside of zenith tower was simulated by Fluent software with VOF model. The phase distribution, velocity vector distribution, absolute velocity distribution and dynamic pressure distribution of miscella of the flow field inner the tower was obtained. The result showed that the dynamic characteristics of the droplet were obtained by pumping miscella into the zenith tower through single-nozzle, which provided a new research method and the necessary theoretical basis for the optimization of zenith tower and the design of the oil droplet distributor. In addition, by establishing numerical simulation method, the accurate and reliable results of liquidliquid twophase flow were obtained.