GB/T 21584-2008 formulates the dropping test method for large-scale dangerous goods Encasement. It specifies the equipment required for the test, and puts forward requirements for the bearing capacity and height adjustment range of the dropping tester. Detailed description of the preparation of large-scale Encasement samples, including the way of filling simulated dangerous goods and sealing treatment. During the test, according to the specified drop height, angle and drop surface, let the large-scale Encasement free fall. By checking whether the Encasement is broken after the test and whether the contents are leaking, the protective effect of the large-scale Encasement on dangerous goods in the drop scene is evaluated. This standard provides specifications for the mass detection of dangerous goods large-scale Encasement, which effectively guarantees the safety of dangerous goods transportation.