Aided exchange decision-making system are changed dramatically or rebuilt， as the rules of electrical market are modified. By detailed study， analyzing and inducing the rules of DongBei regional electrical market（REM）， HuaDong REM and NanFang REM of China， the basic elements are defined to describe all kinds of exchanges of electrical market; exchange flow and its information are summed up and transaction tree model is proposed to picture the static transaction structure. Combining transaction tree model with exchange flow and its information， all kinds of exchanges under different electrical markets are depicted by the uniform pattern; thereby the unified framework of aided exchange decision-making system can be set up.