Based on research and analysis of the application technical characteristics of ARINC661,this paper proposes an interface component design method based on functional interfaces in consideration of the development activities carried out under the User Application of Cockpit Display System (UA-CDS) business architecture.This method is guided by the core business functions of UA,and a display control component library that meets the requirements of UA functions is established,which supports the componentized application development model of CDS.Therefore,the design and development activities of UA and CDS are standardized,which improves the efficiency of interface system development.