Abstract: With the installed capacity of new energy units increasing year by year, higher requirements are put forward for the regulation ability of thermal power generation units.According to the calorific value of some fuels low, or the main steam pressure fluctuates greatly in the lignite blending thermal power units, and poor AGC regulation quality, the unit coordination control system and the control subsystem of wind coal are optimized.It modifies the pressure control logic of the primary duct, and designs the main steam pressure adaptive starting and stopping control system of mill and unit coordination control system.The new control strategy improves the AGC regulation quality of thermal power units in actual operation, and the application effect is good.