The development of island tourism not only promotes the local economic development, but also may bring some negative effects to the local area. First of all, in the economic aspect, because the funds for island tourism development mainly come from other places, the local participation in tourism development is low, resulting in a high leakage rate of foreign exchange income. The narrow tourist market attracted by the island is likely to lead to excessive dependence on this narrow tourist market. Therefore, its tourism economy is very fragile. The forecast of tourism market is inaccurate, which easily leads to the loss of tourism operation. Secondly, if prevention and strict management cannot be strengthened, the development of tourism on the island may cause some social and cultural dross, such as gambling, prostitution, selling folk culture and historical attractions at low prices, committing crimes, following the lifestyle of tourists and losing their original values. With the development of tourism, it has spread rapidly. Third, island tourism development has caused some environmental problems, such as coastal urbanization, dumping construction waste into the sea, crowding out agricultural land and natural vegetation. These problems are usually caused by the lack of strict tourism planning system and the concentration of tourism activities and facilities in several coastal areas.