This paper discusses that there are two sorts of group consensus in Hall for Workshop of Meta-synthetic Engineering: draft consensus and decisive consensus, which are respectively formed in the two synchronous stages in the process of "synchro- nous stages 1- asynchronous stages- synchronous stages 2", and focuses on the concept of draft consensus. Then proposes a draft consensus building model and its solution method called Consen- sus Building Graph, by which claim concern value, claim support value, claim authority value and claim consensus value can be calculated real time for reaching a consensus, and designs a com- puter aided consensus building system called Internet based Group Discussion Environment. The model follows the methodology of meta-synthesis from qualitative to quantitative analysis in which computers and humans are combined to solve complex problems.
