Accurate measurement of steam humidity is essential for safe and efficient operation of steam turbines

drawing significant interest from both academic and industrial communities. The primary techniques for measuring steam humidity in steam turbines are systematically reviewed

encompassing thermodynamic

optical

electrical

chemical

and ultrasonic methods. The principles

characteristics

and applicability of each humidity measurement technique are thoroughly examined

and their respective advantages and limitations are critically analyzed.Furthermore

development trends and future research directions in steam humidity measurement technology are explored. The research provides a robust theoretical foundation for selection and optimization of steam humidity measurement techniques.