The utility model provides a circulating fluidized bed unit system of primary control control, including the fluidized bed unit, with the main control unit of fluidized bed machine group link, its characterized in that: the fluidized bed unit includes boiler, feeder, coal breakage pipe, feedback device, and coal breakage pipe middle part intercommunication has the regulation looped pipeline, and the regulation looped pipeline passes through adjusting device with the feeder and is connected, adjust the inside screw rod that is provided with of looped pipeline, controlling means that adjusting device includes drive screw pivoted actuating mechanism, is connected with actuating mechanism, the coal supply device that communicates with regulation looped pipeline and feeder, being connected feedback device between coal breakage pipe and the boiler, including the oxygen bearing level sensor, data processing module, storage module, the communication module that are connected respectively with CPU, oxygen bearing level sensor detects the oxygen content with data transfer to storage module, and CPU call data from the storage module operates an adjustment order that supplies the picture peg executable module to carry out through data processing module, and the adjustment order transmits the picture peg executable module to through communication module.