From this situation, there are many causes which destroy the coral reef. First water quality was first identified as a threat to its such as high water temperate, chemical in water or suspended sediment concentration which come from agricultural activity where leave the waste water to the sea that it is many chemical to restrain to growth of coral. Second climate change is rise of sea temperature with cause by global warming which is must difficult problem for protection or development it may have triggered the collapse of reef ecosystem because it make the coral bleaching and increase the crown of thorns starfish who is a coral reef predator. Fourth dragging which is current argument between government and people. Because of building port for transportation of coal that they have to dig up the sea to expand the area.