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With the revision of emission standards,deep desulphurization and DeNOx is needed in circulating fluidized bed (CFB) boilers.The operation of the first sot of 300-MW CFB boiler plus limestone/gypsum wet flue gas desulphurization (FGD) system in the world shows that deep desulphurization and DeNOx of CFB boilers has higher SO2 removal efficiency at a lower Ca/S ratio compared with traditional inner desulphurization mode.It can meet the increasingly rigid emission standards,and is suitable for more fuels.Deep desulphurization and DeNOx can also achieve a highly-efficient high-temperature CFB boiler that can not orily achieve inner desulphurization and low NOx emission,but benefits low-grade,high sulfur content fuels as well.Research of deep desulphurization and DeNOx will be a developing direction for CFB boilers.