The utility model belongs to the technical field of X ray image, a tomography system and tomoscan control circuit thereof is provided. The utility model discloses an adopt the tomoscan control circuit who sends X ray source array and high voltage dc source including drive module, a plurality of high -pressure control module, cold cathode field in the tomography system, send exposure time series signal to drive module by the detector of tomography system, by drive module according to the single pulse signal of exposure time series signal output multichannel, control the transmission chronogenesis that X ray source array was sent to the cold cathode field according to the single pulse signal of multichannel respectively by a plurality of high -pressure control modules to make a plurality of cold cathode fields send the X ray source and in proper order to target object transmission X ray, owing to adopt the full static scanning mode of electronic type, consequently practiced thrift the cost of the rotatory frame of high accuracy, and can not have the pseudo - shadow of motion in the imaging process, simultaneously, owing to adopt pulse exposure mode, thus avoided invalid radiation does's production in the scanning process.