Abstract: The latest 1 ∶ 100 000 aeromagnetic data obtained from Hainan Island and the surrounding waters were used in combina?tion with geological,geochemical and remote sensing information and,as a result,63 concealed and semi?concealed faults were in?ferred,12 volcanic apparatuses as well as 188 intrusions were confirmed,and 18 favorable prospecting areas were delineated where 63 prospecting target areas were further delineated. The geological interpretation results obtained have provided the most complete and valuable regional geophysical data for the basic geological survey,marine geological survey and mineral resource exploration arrange?ment in Hainan Island.