The growth characteristics of Porites lutea skeleton in east sea area of Hainan Island were studied by Coral XDS software based on X-ray chronology. The growth parameters obtained included extension rate( ER),skeleton density( D),and calcification rate( CR). The results showed that ER varied from 0.49 to 1.10 cm·a~(-1) with an annual average of 0.76 cm·a~(-1),D varied from 1.11 to 1.35 g·cm~(-3) with an annual average of 1.22 g·cm~(-3),and CR varied from 0.55 to 1.41 g·cm~(-2)·a~(-1) with an annual average ...