With the good ecological functions, the raw-soil structures attract attention of the people all over the world recently. According to surveys, more than 30 million farmers in China still choose to build their house using raw-soil. Since the advent of CAD/CAE techology, it became easier for engineers to design better buildings. However, for lack of adequate research on raw-soil structure, existing domestic and oversea softwares are incapable of solving the detailing work of this structure. In this paper, characteristics of the raw-soil structure and software function requirements are analyzed; the framework, data structure kernel are designed for a specialized detailing CAD information system based on BIM (Bulidgin Information Modeling). Finally the raw-soil software is developed with Object ARX technology and AutoCAD graphics platform, and an example is introduced to show the main functions.