Abstract: The assessment of islands' coastal vulnerability plays an important role in islands’ protection, utilization,and sustainable development. Based on the basic data such as coastline type, DEM, coastal vulnerability of Miaodao archipelago was studied by using InVEST model. The results showed that: (1) In the ten inhabited islands of Miaodao archipelago, the average exposure degree from low to high was Xiaoqin island, Miaodao island, Nanchangshan island, Nanhuangcheng island, Daqin island, Xiaoheishan island, Daheishan island, Tuoji island, Beihuangcheng island and Beichangshan island. (2) In the northern islands of Miaodao archipelago, the coastal exposure of Beihuangcheng island and Tuoji island was high, that of Xiaoqin island was low, and that of Tuoji island and Daqin island was medium. In the southern islands, the coastal exposure degree of Miaodao island was low, that of Beichangshan island was high, and that of Nanchangshan island, Daheishan island and Xiaoheishan island was medium. (3) The main factors affecting coastal vulnerability of Miaodao archipelago are coastline type, altitude, location, etc., and the coastal exposure of Beihuangcheng island, Daqin island, Xiaoqin island and Beichangshan island was greatly affected by coastline type; the coastal exposure of Nanhuangcheng island, Tuoji island, Daheishan island and Xiaoheishan island was greatly affected by altitude; the coastal exposure of Nanchangshan island was greatly affected by location.