Taiping Island, also known as Itu Aba, is part of the Spratly Island chain, embroiled in increasingly tense South China Sea territorial disputes.
Although it is controlled by Taiwan, the island is also claimed by mainland China, Vietnam and the Philippines.
Four new structures have appeared since Google Earth's last satellite images.
The images showed four three-pronged structures in a semi-circle next to an upgraded airstrip and near a sizeable new port.
What is the South China Sea dispute?