Eight pieces of marine porcelain found at the Hua Guang Jiao No.1shipwreck site at Xisha were conserved by removing surface concretion, desalting and filling of spaces between fragments. The surface coating was analyzed by Xray Diffraction (XRD), and the porcelain surface was compared before and after being desalted using threedimensional visual microscopy. The contents of micropores on the surface were determined by using scanning electron microscopy (SEM) and variations in conductivity from the desalting process were measured using a conductivity meter. The results indicate that concretion coating that is easily removed by mechanical methods is magnesium calcite and aragonite, the part that is hard to remove was kutnahorite and aragonite. The white substance deposited in the micropores is a salt containing fluorine. After two weeks of desalting, the conductivity in the porcelain declined to a low level. This research provides information relavant to future conservation of porcelain excavated from the Xisha sea area.