Abstract: Coal feeder is an important auxiliary equipment of coal-fired generating unit and an important part of pulverizing system. Its operation status directly affects the safe production and operation of coal-fired unit. The oscillation phenomenon of coal feeding amount occurred in the pulverizing system of a 600 MW supercritical thermal power generating unit was analyzed,and the cause of the solutions was given. Through the optimization and debugging of the control logic,after long-term operation monitoring,such problems have not occurred again. The expected effect has been achieved.