Abstract: By now,the traditional ways of MDA developing process have always been the manual capture and text descriptions,which has affected the accuracy and consistency of both demand model and PIM model,and reduced the automation degree of MDA development．This article offered the way of how to develop a visual demand capture tool．With the technology of MDA framework and the GEF adopted in whose development,this tool runs the demand capture in the goal-situation capturing way.Whereas it offers the feasibility of exporting the demand model in the form of both requirements document and XML,and provides enough information for the conversion from demand model to PMI model．Finally,the examples offered in this article demonstrate the effectiveness of the capture tool．By this tool,the lack of independent requirements capture process can be made up,and to some extent,the development of MDA process and the automation degree of MDA software can be improved.

Key words: MDA,Requirement capture,Requirements metamodel,EMF,GEF