dual view angle device Due to the traditional imagining technology which the projection images of 3D-objects are perpendicular to the perspective direction, the final image is the result of all objects superposed on the light path of imagining. Therefore, to the parcels with intentionally hidden dangerous goods or complex parcels, single view system screening efficiency is relatively low and the correct detection rate is also affected. Due to the traditional imagining technology which the projection images of 3D-objects are perpendicular to the perspective direction, the final image is the result of all objects superposed on the light path of imagining. Therefore, to the parcels with intentionally hidden dangerous goods or complex parcels, single view system screening efficiency is relatively low and the correct detection rate is also affected. We can observe the knife does not look obvious in view-angle-1 in the following picture when the knife and gun are positioned in X-ray inspection system at a certain angle. To single-view device, usually, the suspicious objects are needed to be re-scanned at another angle; however, due to the dual-view devices provided another angle of view (angle 0), the existence of the knife and its exact position both can be certainly identified, which improves the actual passing through rate. The box of 24 cans liquid, in both horizontal and vertical directions of each row was set with only one empty bottle in the array. After scanning, we can`t find any clue from view angle 0, while we can obviously find the problem from the view angle 1. Similarly, if there are some dangerous goods are hidden in those empty bottles, compared with the traditional dual channel single view device, dual channel dual view devices will give its full play of advantages.