assessment begin at Ranong, Phang Nga in May 2005. by sampling using line transect line length of 20-60 meters from the 52 sampling stations in Ranong. The measurement is based on the length and slope of the reef. By the start of the coastal slope and ends at the edge of the slope. The coral reefs in Surin and Torinla islands (Surin Marine National Park). The depth and slope uses three transect lines (15, 20, and 25 meters) along the coast. In the 36 sampling stations on the islands of coral bleaching on average, as measured by measuring the proportion of coral reef bleaching and residents along the line (Transect).