Abstarct: Accelerated growing up of energy consumption in the world has been made humanities to be more dependent to energy sources. The consumption of natural gas as one of the most important energy sources has been grew up rapidly in last decade. Regarding gas consumption in Iran and so for other countries, limitation existence in natural gas production to consumption chain has been faced up such countries to energy shortage especially in cold months of the year. The main purpose of gas storage is to overcome this problem. Nowadays, underground natural gas storage especially in salt formations (for its many advantages) has been used more and more in recent years. Existence of huge and favorite salt formations in Iran has been prepared good situation to use this underground storage method. Consideration stability of salt cavern, the integrity of this underground space which used for gas storage purpose is vital. Various parameters such as cavern geometry and geologic parameters, operation conditions and geomechanic properties of surrounding rock of cavern has effect on behavior of this underground space. The purpose of this study is investigation of the manner of these parameters on stability of salt cavern under various situations by using LOCAS software. LOCAS is finite element software specially dedicated to salt caverns. The results of this study show that cavern depth, minimum and maximum operation pressures and creep properties of salt rock respectively are most important parameters which are effect on stability of salt caverns.