With the development of natural gas exploration and development, the depth of the newly discovered gas field is increasing year by year, and the composition of nature gas are becoming more and more complex.During the dehydration process of a high temperature and high pressure gas field in Western China, there is solid precipitation in the cryogenic separator, which blocks the components of the separator, resulting in the increase of the pressure difference between the two ends of the cryogenic separator.An experimental method of solid phase precipitation in natural gas is established to determine the precipitation temperature of the solid in the natural gas.Regularities ofgas phase, liquid phase and solid statedistributionunder different temperatures and pressures have been obtained by simulating gas, liquid and solid equilibrium in natural gas. It can provide reliable data support and theoretical basis for process modification of natural gas treatment plant, and also provide reference for process design of similar natural gas treatment plant.