In recent years,with the rapid increase in national electricity demand and energy-saving environmental protection requirements to further improve and develop high-capacity,high efficiency,ultra (ultra) supercritical thermal power units parameter is the current mainstream trends.TP347H austenitic heat-resisting steel as good high temperature oxidation resistance,creep resistance,intergranular corrosion,and excellent welding and hot and cold processing has been widely applied to power plant maintenance and major domestic supercritical capacity power plant boilers.Cold process is important in the production of seamless steel tube.This paper aims at TP347H steel tube,used by high-preesure boiler.Through the studying the effect of cold deormation of steel tube on grain size and mechanical properties at room temperature and solution state,giving reasonable supports for developing the cold process of TP347H steel tube.Through study found that the increasing cold size results to thinner steel crystals and the line slip in the topaz.When the cold size come up to 15%,20%,room temperature as the same as flow of yield strength and intensity increase.In mixed condition of solid and liquid,the line slip in the topaz disappears,as the increasing cold size,room temperature as the same as flow of yield strength and intensity decrease,of the orb of the same thin,and yield strength to strength and pulled all possible.In the same temperature,with cold size increased,the shape of the yield strength to strength,and the extension section of the laws not change significantly.At the same amount as shape,keola the temperature increases,high yield strength and pulled out to reduce intensity. In recent years, with the rapid increase in national electricity demand and energy-saving environmental protection requirements to further improve and develop high-capacity, high efficiency, ultra (ultra) supercritical thermal power units parameter is the current mainstream trends. TP347H austenitic heat- resisting steel as good high temperature oxidation resistance, creep resistance, intergranular corrosion, and excellent welding and hot and cold processing has been greatly applied to power plant maintenance and major domestic supercritical capacity power plant boilers. Cold process is important in the production of seamless steel tube. This paper aims at TP347H steel tube, used by high-preesure boiler. Through the studying the effect of cold deormation of steel tube on grain size and mechanical properties at room temperature and solution state, giving reasonable supports for developing the cold process of TP347H steel tube.Through study found that the increasing cold size results to thinner steel crystals and the line slip in the topaz.When the cold size come up to 15%, 20%, room temperature as the same as flow as yield strength and intensity increase.In mixed condition of solid and liquid, the line slip in the topaz disappears, as the increasing cold size, room temperature as the same as flow as yield strength and intensity decrease, of the orb of the same thin, and yield strength to strength and pulled all possible.In the same temperature, with cold size increased, the shape of the yield strength to strength, and the extension section of the laws not change significantly. At the same amount as shape, keola the temperature increases, high yield strength and pulled out to reduce intensity.