Large hospital ship is one of the important symbols of modern navy. At present, the world **** have the United States, Britain, Canada, Japan, China and a few other countries have a distant sea medical rescue capability of the hospital ship, these hospital ships are converted from civilian ships. Among them, the U.S. Navy has two "Mercy"-class hospital ships, mainly in South America and Southeast Asian countries on a regular basis to carry out medical rescue activities, and in the event of large-scale disasters to provide emergency relief. The United Kingdom has a private medical ship "Africa Love", mainly for the world's less developed regions or war-torn areas to provide charitable medical activities.