Abstract: The two-trough liquid distributor is advantageous with high-quality distribution performance and big operational flexibility, but its requirement on levelness is extremely strict. In order to increase the adaptability of trough liquid distributor to offshore sloshing conditions, therefore, its traditional structures shall be optimized. In this paper, the studies on the effects of various sloshing forms on the liquid distribution performance of trough liquid distributor were reviewed. Then, Fluent software was adopted to carry out fluid dynamics numerical simulation on the secondary trough which is more affected by the sloshing. Accordingly, the reasons for the liquid distribution quality deterioration of secondary trough in the sloshing condition were figured out, and the corresponding structure optimization measures were proposed and verified by means of simulation method. It is indicated that the liquid distribution quality of trough liquid distributor in the conditions of stillness and sloshing can be improved effectively by increasing the diameter of the orifices on both sides of the inlet of secondary trough or adding vertical baffles. If buffer baffles are added, the liquid distribution quality in the stillness condition can be improved, but the flow uniformity of secondary trough in the sloshing condition will be deteriorated further. The optimized trough liquid distributor is better adaptive to offshore sloshing platforms or floating production, storage and offloading devices.