Shuangyu artificial island(commissioned by China Merchants Group Zhangzhou Economic- Technological Development Area) is the first domestic artificial island which is approved by the State Council to be fully developed for tourism, living and ecology. This paper particularly introduces how to consider the connection between Shuangyu island’s preceding land reclamation design and later layout and building, and intensively researches key technology such as the artificial island layout, the structural scheme of the outer revetment, land reclamation, soil ground treatment, architecture with special function, et al. according to the features that the engineering geological location is relatively complex and the thickness of silt layer is large.