Abstract: Conditions of gas hydrate formed in the wellhead of gas storage are presented and influences of temperature changing law in weUhead and gas components on the formation of gas hydrate are analyzed. Results indicate that the rudimental brine in salt-caverns forming process and continuous cycle of injection and production in operation of gas storage caverns make the temperature and pressure of the wellhead more possible falling in the range of hydrates formation; and sensitive degree of gas components will influence on forming of gas hydrate. Analysis results may provide theoretical reference to prevention of hydrate formation in wellhead of gas storage caverns and take effective measures to preveht from hydrate formation.