Diels-Alder reaction has a huge application value due to their high stereoselectivity.The reactive region of this kind of cycloaddition includes not only atoms but also the important π bond zones.In this article,we utilized the ABEEM-σπ model to research this kind of reactions,and through the regional softnesses of both the atoms and π bonds,which were calculated by this model,we interpret properly the stereoselectivity of the typical Diels-Alder reaction.