Many gas reservoirs with high H 2 S content have been found in China, such as Luojiazhai Gas Field and Puguang Gas Field, and they play an important role in China's natural gas industry. However, there are a series of serious problems in production of these gas reservoirs, such as H 2 S poison, strong corrosion, and sulfur deposition. Therefore, it is important to gas flowing theory study on gas reservoirs with high H 2 S content. This paper discusses sour gas flow and sulfur deposition. Based on the experimental work and aerodynamics gas-solid flow theory, threedimensional multi-component mathematical model for sour gas reservoir is developed. In the model, factors of affecting sulfur particle deposition has been studied, including gas flow rate, initial H 2 S concentration and formation permeability.