A CT inspection system, comprising a radioactive source device configured to emit a beam at a beam emitting frequency; a detection device configured to synchronously rotate with the radioactive source device at a non-uniform speed in at least a partial process of scanning an object to be inspected (a); and an imaging device; characterized in that, the CT inspection system further comprises a frequency multiplying device, which multiplies a beam emitting frequency of the radioactive source device by N times and to transmit a multiplied frequency to the detection device, wherein N is greater than or equal to 2; a rotation monitoring device, for detecting a rotation angle of the detection device and transmitting an angle signal to the imaging device each time the detection device rotates by a preset angle; the detection device is configured to obtain detection data based on the multiplied frequency transmitted by the frequency multiplying device, so that the detection device is configured to obtain the detection data at a frequency that is N times the beam emitting frequency of the radioactive source device, and the detection device is configured to obtain N groups of detection data which subdivide the preset angle between two adjacent angle signals; and the imaging device comprises an information processing device and an image processing device, the information processing device is configured to receive the angle signal transmitted by the rotation monitoring device, the detection data of the detection device, and beam emitting information of the radioactive source device, and determine a rotational position of the detection device each time the radioactive source device emits a beam based on angle signals transmitted by the rotation monitoring device, the detection data of the detection device between every two adjacent angle signals transmitted by the rotation monitoring device, and beam emitting information of the radioactive source device by determining, amongst the N groups of detection data, a group of detection data at which the radiation source device emits a beam in the N groups of detection data between two adjacent angle signals of the rotation monitoring device, determining a data sequence number of the determined group of detection data, and adding an angular amount corresponding to the preset angle divided by N and multiplied by the data sequence number of the group of detection data obtained by the detection device when the radiation source device emits a beam, to the angle of the detection device corresponding to the previous angle signal in the two adjacent angle signals of the rotation monitoring device, and the image processing device is configured to generate a CT image based on the detection data and the rotational position of the detection device each time the radioactive source device emits a beam. a radioactive source device configured to emit a beam at a beam emitting frequency; a detection device configured to synchronously rotate with the radioactive source device at a non-uniform speed in at least a partial process of scanning an object to be inspected (a); and an imaging device; characterized in that, the CT inspection system further comprises a frequency multiplying device, which multiplies a beam emitting frequency of the radioactive source device by N times and to transmit a multiplied frequency to the detection device, wherein N is greater than or equal to 2; a rotation monitoring device, for detecting a rotation angle of the detection device and transmitting an angle signal to the imaging device each time the detection device rotates by a preset angle; the detection device is configured to obtain detection data based on the multiplied frequency transmitted by the frequency multiplying device, so that the detection device is configured to obtain the detection data at a frequency that is N times the beam emitting frequency of the radioactive source device, and the detection device is configured to obtain N groups of detection data which subdivide the preset angle between two adjacent angle signals; and the imaging device comprises an information processing device and an image processing device, the information processing device is configured to receive the angle signal transmitted by the rotation monitoring device, the detection data of the detection device, and beam emitting information of the radioactive source device, and determine a rotational position of the detection device each time the radioactive source device emits a beam based on angle signals transmitted by the rotation monitoring device, the detection data of the detection device between every two adjacent angle signals transmitted by the rotation monitoring device, and beam emitting information of the radioactive source device by determining, amongst the N groups of detection data, a group of detection data at which the radiation source device emits a beam in the N groups of detection data between two adjacent angle signals of the rotation monitoring device, determining a data sequence number of the determined group of detection data, and adding an angular amount corresponding to the preset angle divided by N and multiplied by the data sequence number of the group of detection data obtained by the detection device when the radiation source device emits a beam, to the angle of the detection device corresponding to the previous angle signal in the two adjacent angle signals of the rotation monitoring device, and the image processing device is configured to generate a CT image based on the detection data and the rotational position of the detection device each time the radioactive source device emits a beam.