Abstract: Combining the storage and transportation characteristics of cryogenic liquefied petroleum gas and loading/unloading system in full-refrigerating LPG ship, the paper introduces the wharf soft coupling facilities, maintenance measures of cryogenic LPG at low temperature, and the selection of loading/unloading pipe materials, describes the loading/unloading techniques of cryogenic LPG in the flow processes of unloading, purging, and circulating cooling.