Abstract: With the construction of a new-type power system and the advancement of the "dual-carbon" goals, the proportion of new energy in the power system has significantly increased. 1000MW steam turbines are facing a transformation from the traditional stable operation mode to flexible operation to meet the needs of power grid peak regulation and frequent start-ups and shutdowns. This paper focuses on the research of flexibility operation transformation technology for 1000MW steam turbines, analyzes the challenges under flexible operation, and expounds a series of transformation technologies ranging from the optimization of the structure, adjustment of control strategies to the upgrading of monitoring systems. It provides technical support for improving the adaptability and reliability of generators in the new-type power system and offers references for enhancing the flexibility of coal-fired power.