Graphics subsystem has a special status in an energy management system (EMS) based on IEC 61970. For the Client/Server (C/S) structure
graphic subsystem becomes the most important subsystem on clients to directly face all the users. To adapt the C/S structure
we present an interface/application/logic/service four-layered framework to develop the graphics subsystem. Such new techniques as trans-platform developing toolkit QT
component technology
screen-guarded process management and channel subscription are also adopted.