The article introduces the application of Keyuan NT6000 DCS in the fume desulphurization project； and mainly introduces the choices of desulphurization technology and focuses on the description of the principle of fume desulphurization technology in dalate electric power plant and the application of NT6000 system in the desulphurization synthesized automation system. The system has run steady since it has been put into operation; it not only creates the significant economic benefit but also protects environment and persistent development