A ray detection system, comprising a ray imaging subsystem configured to generate ray transmission images, wherein the ray imaging subsystem comprises: a ray source configured to generate ray pulses capable of penetrating a detected object and having a beam center; a vertical detector arm; a plurality of detector modules arranged on the vertical detector arm, wherein each of the plurality of detector modules is configured to receive the ray pulses generated from the ray source as being capable of penetrating the detected object and is configured to convert the ray pulses into output signals; and a data acquisition and control module configured to generate digital image signal in real time according to the output signals; wherein the ray detection system further comprises a plurality of detector circuit boards fixed to the vertical detector arm; wherein each of the plurality of detector modules comprises a plurality of detector units arranged in a scattered configuration, wherein each of the detector units of each detector module is installed aiming at the beam center of the ray source according to an irradiation direction of a ray beam generated by the ray source; wherein each of the plurality of detector modules is fixed to one of the plurality of detector circuit boards and a plurality of detector units are fixed to each of the plurality of detector circuit boards; wherein an angle at which each of the detector units is installed is related to a height of the corresponding detector unit on the vertical detector arm, so as to ensure each of the detector units to be aimed at the beam center and aimed at the irradiation direction of the ray beam, and wherein a shape of each of the plurality of detector circuit boards is related to a position of the detector circuit board on the vertical detector arm. a ray source configured to generate ray pulses capable of penetrating a detected object and having a beam center; a vertical detector arm; a plurality of detector modules arranged on the vertical detector arm, wherein each of the plurality of detector modules is configured to receive the ray pulses generated from the ray source as being capable of penetrating the detected object and is configured to convert the ray pulses into output signals; and a data acquisition and control module configured to generate digital image signal in real time according to the output signals; wherein the ray detection system further comprises a plurality of detector circuit boards fixed to the vertical detector arm; wherein each of the plurality of detector modules comprises a plurality of detector units arranged in a scattered configuration, wherein each of the detector units of each detector module is installed aiming at the beam center of the ray source according to an irradiation direction of a ray beam generated by the ray source; wherein each of the plurality of detector modules is fixed to one of the plurality of detector circuit boards and a plurality of detector units are fixed to each of the plurality of detector circuit boards; wherein an angle at which each of the detector units is installed is related to a height of the corresponding detector unit on the vertical detector arm, so as to ensure each of the detector units to be aimed at the beam center and aimed at the irradiation direction of the ray beam, and wherein a shape of each of the plurality of detector circuit boards is related to a position of the detector circuit board on the vertical detector arm.