Technical and professional difficulties of composite foundation designing are introduced and discussed. In combination with a practical foundation project, i.e. Wangjing B11-1 project in Beijing, the implement of JCCAD foundation designing software is shown. Moreover, the analysis result is compared with actual measured data. To meet further demand on the design works of more complicated foundations, a new foundation and underground structure design software suite based on BIM technique is being developed by PKPM.