我国有几千年的封建社会史，封建帝王在享尽人间豪华、吃喝玩乐之余，还希望能永远活下去，直到长生不死。于是，出现了投其所好的方土之流，宣传海外有三神山（蓬莱、方丈、瀛洲）产长生不死之药。统治者为获得这种仙药，派人到海外寻求，史有记载的，如秦始皇派徐市（福）率 In our country, there are thousands of years of feudal social history. The feudal emperors, while enjoying the deluxe world, enjoy eating and drinking, and hope to live forever until they live forever. As a result, there has been a vote of the best of their own land, propaganda overseas Sannisshan (Penglai, abbot, Yingzhou) immortal medicine. Rulers to get this cents medicine, send people to seek overseas, history records, such as the Qin Shi Huang sent Xu (Fu) rate