For high temperature and high pressure gas reservoirs with high salinity water, factors affecting salting out phase and production were analyzed in this paper. Because the formation water contains electrolytes, the four phase model of gas-condensate oil­ formation water-solid was established by adopting Pitzer model to characterize solid sodium chloride thermodynamic equilibrium. In the process of production with high salinity formation water, the water content in the gas increases and the density of formation water increases then slightly decreases. The liquid density summit divided the process into  “non-salting process” and  “salting process”. The salinity of water inhibited the evaporation and accelerated the salting. The lower permeability, higher ineducible water saturation or higher salinity, the amount of salting is greater. Greater gas production or lower well bottom pressure in the production performance analysis, the salting out amount is greater. Salting has a greater impact on single well potential productivity which causes the porosity and reduced permeability. In this paper, solid foundation has been laid for salting-out prediction of HT/HP gas reservoir of high salinity stratum water.