Abstract: The natural gas supersonic separation technology is the new dehydration technology which is developed in recent years. The vortex generator and nozzle are two key components of the natural gas supersonic separator. Numerical simulation research was carried out on the flow fields of three types of vortex generators with straight blade, angled blade and curved blade. The results show that the vortex generator with curved blade has a good performance. In addition, the nozzle flow of the natural gas supersonic separation was studied, and the results proved that the vortex generator and nozzle mentioned in this paper can get lower temperature and more powerful centrifugal force, which will condense the water vapor in the natural gas into small droplets and then be separated out so as to achieve the goal of natural gas dehydration.