This paper reveals the latest controlling strategy of 600 MW thermal power generating unit.It sums up the optimization procedure of controlling strategy on coordinated control system of the air-cooled sub-critical drum-boiler

which is Unit #1 (600 MW) of Guohua Jinjie Energy Co.

Ltd.Based on the routine framework of controlling strategy coordinated based on BFT

the rational optimization strategies are added by which the unit coordination controlling performance are largely improved.The main optimization strategies are as follows: to largely raise the speed of respond to boiler side by comprehensively optimizing the boiler master control feed forward unit

canceling the restriction to air-coal cross

optimizing primary air controlling system and oxygen and secondary air controlling system; to raise speed of respond to unit load by optimizing throttle pressure setting value to calculate the rational use of boiler drum thermal storage.The above methods can also be generally applied to the coordination and controlling system of other thermal power generation units to raise speed of respond to unit load and improve the stability of unit operation.