Provided is a beam output control method for an optical machine in an imaging system. Also provided are a beam output control apparatus for an optical machine in an imaging system, and a CT imaging system, an electronic device, a storage medium and a program, which relate to the technical field of security inspection imaging. The control method comprises: receiving an encoder signal and an optical machine beam output signal, and performing initialization synchronization on the encoder signal and the optical machine beam output signal (S210); recording an encoding value M of an encoder at a moment tm, and an encoding value N of the encoder at a moment tm+1, wherein M, N and m are integers (S220); when it is determined that the difference between the encoding value M and the encoding value N satisfies a preset value a, determining the duration from the moment tm to the moment tm+1 as an actual beam output time interval T of an optical machine, wherein a is an integer (S230); determining a gap time TG in the actual beam output time interval T on the basis of a preset beam output time interval TJ of an imaging system and the actual beam output time interval T (S240); and controlling the optical machine to not emit a light beam in the gap time TG (S250). By means of the control method, the problem of disordered sampled images caused by belt speed fluctuations is solved.