Our long-term studies on coral reef ecology in the Gulf of Thailand provides a good opportunity to examine the impact of different mass coral bleaching events on those reef sites. This study presents a comparison of the bleaching and mortality of corals between the mass bleaching events in 1998 and 2010 at a coral community in the Western Gulf of Thailand. It will identify the coral species most likely to suffer from and be able to tolerate changes in seawater temperature.