Designing process of Hainan Island's soter database at 1 200 000 scale is discussed in detail here. It analyses the principles and methods of middle scale SOTER mapping, and train of thought of collecting and organizing the attribution data of the mapping units. On the basis of these, we have drawn out the dividing indices systems of mapping units of studying area, completed the dividing and mapping of SOTER units of the studying area, and constructed studying area SOTER database at a scale 1 : 200 000, including a central database and a accessory database. The study will play positive roles in making SOTER methodology perfect and making scientific decisions in Hainan landuse management.