First proposed the Shanxi Coal Power Plant PhaseⅡPingshuo 2×300MW CFB direct air cooled system winter frostproof protection of frost question, introduced its direct air cooled system of the power plant control system, elaborated the automatically controlled scheme of frostproof in the direct air cooled system, analyzing the existing existence question and carring on to optimization the existing programs, meanwhile, the engineering operation for further elaboration and analysis, optimized the direct air cooled system's frostproof protection control scheme. Keywords-the direct air cooled system; winter protect; automatic control; circulation fluid bed;2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring 978-0-7695-4350-5/11 $26.00