X-ray backscatter-channel vehicle security check system based on distributed radiation sources

The utility model provides an X-ray backscatter-channel vehicle security check system. The system comprises one or more backscatter detection subsystems configured to emit X rays to a to-be-checked target and check the target through detecting scattering signals, and a control system configured to adjust the distance between the corresponding backscatter detection subsystem and the irradiated position of a side of the target according to the size of the target to optimize the scattering signals of the detection. The system can be adapted to targets of different sizes or shapes to be checked and enhances the backscatter image signals.