Abstract: This article analyzes the problem of Shiheng Thermal Power Co., Ltd. #1 unit coordinated control system, diagnoses the control strategy that affects the unit's coordinated quality, and takes corresponding improvement measures. So as to ensure that the coordinated control system of unit #1 can be put into operation stably and reliably, and further put in the AGC function to meet the needs of modern large-scale power grid operation and management, and to meet the assessment requirements of the two detailed rules of power grid dispatch.