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The operating status of the steam separator of ultra supercritical units is different during unit start-up and high or low load; and the role of the steam separator is also different. In the steam separator wet operating mode, steam water mixtures co-exist with superheated steam in the separator. The separator plays the role in separating uperheated steam from the steam water mixtures. Thus, by controlling feedwater flow to control water level of the separator for stable operation of the unit plays an important role. In this paper, the fuzzy controller is designed to control the water level of the steam separator. And using MATLAB simulation software to control simulate the system, drawing relevant parameters and operating curve. The results show that the fuzzy control can effectively prevent or impair the overshoot of the PID controller, and has a strong robustness, this improved the quality of control effectively.