Viral hemorrhagic fever is a group of natural epidemic diseases caused by arboviruses, with fever, bleeding and shock as the main clinical features. This type of disease is widely distributed in the world, with severe clinical manifestations and high mortality. The pathogens, parasitic hosts and transmission routes are different, and the clinical manifestations are also somewhat different. They are often prevalent in certain areas. Since the 1960s, more than a dozen types of hemorrhagic fever caused by viruses have been discovered around the world. Among them, epidemic hemorrhagic fever (hemorrhagic fever with renal syndrome), dengue hemorrhagic fever and Xinjiang hemorrhagic fever (Crimean-Congo hemorrhagic fever) that occur widely in China are.