Abstract: Based on the operation status of AGC performance index of unit 11 in a power plant, combined with the index parameters in the relevant assessment rules of AGC in Hebei Province, the problems existing in AGC regulation quality of unit 11 in the power plant are analyzed after repeated field tests and certification. Analysis is made from such following aspects as receiving signals, coordinating control logic, sending real power signals, adjusting parameters, and controlling system calculation cycle, and suggesting corresponding corrective measures. The AGC regulation performance index of unit 11 in the power plant is improved, the AGC load follow depth generation quantity is enhanced, and the electric quantity compensation cost is increased in disguised form, which realized the expectation that the original index was changed from the loss state assessed by provincial dispatching to the profit state, and achieved the goal of potential tapping and efficiency improvement of the unit.