Abstract: Coral reefs are the high ecological system of biodiversity and have an important ecological function. After the 1980s large degradation of global scope of coral reefs caused people wide attention. Using high resolution images based on Quickbird data, coral reefs geometry parameters and development index the Nansha typical reef development is monitored through remote sensing In the waters against the wind, coral reefs bodies there are the texture characteristics, which shows that the sea surface roughness and underwater reef development characteristics. The results show that because Nansha reefs are inflnencdby geologiy and climate, development degree is differ, half moon reef development is better, development index is 0.38, the reef development index of 0.27. Geometry parameters to are estabtished monitor the Nansha coral reef development status which can provide the scientific basis the protection of the coral reefs.