A spiral Computed Tomography, CT, device for inspection of large cargos, comprising: an inspection station operable to carry an object to be inspected on a carrying surface thereof, wherein an inspection space is defined above the carrying surface, a normal direction for the carrying surface is a first direction, and the inspection station is operable to move along a second direction perpendicular to the first direction to cause the object to be inspected to pass through the inspection space; a rotational supporting apparatus disposed around the inspection space in a plane perpendicular to the second direction and operable to rotate around the inspection space; characterized in that the spiral CT device further comprises a plurality of X-ray accelerators (130-1, 130-2) located on the rotational supporting apparatus and configured to transmit X-rays to pass through the inspection space; and a plurality of X-ray receiving apparatuses (140-1, 140-2) in one-to-one correspondence to the plurality of X-ray accelerators, the plurality of X-ray receiving apparatuses (140-1, 140-2) being located on the rotational supporting apparatus and opposing to the plurality of X-ray accelerators (130-1, 130-2) respectively, the plurality of X-ray receiving apparatuses (140-1, 140-2) being configured to collect the X-rays passing through the inspection space, wherein the plurality of X-ray accelerators (130-1, 130-2) and the plurality of X-ray receiving apparatuses (140-1, 140-2) are operable to rotate with the rotational supporting apparatus; wherein the plurality of X-ray accelerators (130-1, 130-2) are closely disposed on the rotational supporting apparatus, and fan-shaped X-ray beams provided by the plurality of X-ray accelerators (130-1, 130-2) cover the inspection space with a minimum degree of overlapping. an inspection station operable to carry an object to be inspected on a carrying surface thereof, wherein an inspection space is defined above the carrying surface, a normal direction for the carrying surface is a first direction, and the inspection station is operable to move along a second direction perpendicular to the first direction to cause the object to be inspected to pass through the inspection space; a rotational supporting apparatus disposed around the inspection space in a plane perpendicular to the second direction and operable to rotate around the inspection space; characterized in that the spiral CT device further comprises a plurality of X-ray accelerators (130-1, 130-2) located on the rotational supporting apparatus and configured to transmit X-rays to pass through the inspection space; and a plurality of X-ray receiving apparatuses (140-1, 140-2) in one-to-one correspondence to the plurality of X-ray accelerators, the plurality of X-ray receiving apparatuses (140-1, 140-2) being located on the rotational supporting apparatus and opposing to the plurality of X-ray accelerators (130-1, 130-2) respectively, the plurality of X-ray receiving apparatuses (140-1, 140-2) being configured to collect the X-rays passing through the inspection space, wherein the plurality of X-ray accelerators (130-1, 130-2) and the plurality of X-ray receiving apparatuses (140-1, 140-2) are operable to rotate with the rotational supporting apparatus; wherein the plurality of X-ray accelerators (130-1, 130-2) are closely disposed on the rotational supporting apparatus, and fan-shaped X-ray beams provided by the plurality of X-ray accelerators (130-1, 130-2) cover the inspection space with a minimum degree of overlapping.