Abstract: Low cycle fatigue(LCF) experiments were carried out under strain control at room temperature on X12CrMoWVNbN10-1-1 steel for rotors used in ultra-supercritical turbines.Some LCF parameters of this material at room temperature including Ramberg-Osgood parameters,Manson-Coffin parameters and transformation life were obtained by fitting the cyclic stress-strain curves and strain-life curves.The peak tensile stress,the peak compression stress,the unloading elasticity moduli of tension and compression,and the area of the hysteresis loop in the LCF initial stage and finial stage were analyzed by comparison.The stress changes corresponding to LCF controlled by different strain amplitudes were discussed.