The research and application of supersonic separator (3S for short) have been extensively investigated and applied overseas, but is not yet adequate in China. Numerous theoretical studies have been conducted, which mainly focus on the swirl flow, the internal flow and the condensation process. However, experimental results, specially on condensation and separation mechanism of high⁃pressure natural gas are rarely reported, as well as industrial and field test. A lot of work has been carried out in structural design, mainly focusing on comparative analysis, and no feasible structural design strategies have been proposed. The basic research on droplet condensation is even rarer. At present, the process is mainly characterized by CNT and Gyamathy model. In pratical conditions, an appropriate model needs to be selected for calculation and analysis according to the characteristics of various modified models. In order to improve the efficiencies of gas condensation and gas⁃liquid separation, the next research should focus on the effect of the main factors, such as the inlet temperature & pressure, supersaturation, the converter installation position, the supersonic nozzle structure, on the condensation process, so as to the experimental researches on the high⁃pressure natural gas supersonic separation. The industrialization of domestic supersonic separators will provide an effective tools to the dehydration, deacidification, de⁃heavy hydrocarbon before pipelining for the limited offshore platform.