Abstract: This study extracts four nuclear words from social constructionist Psychology, which word can be representative of one hierarchy of this system. They constitute social constructionist Psychology jointly. (1) Criticism: people can never “reflect” the real world as it is .(2)Construction: the mind is constructed through social processes. (3)Discourse: which is the most important force for social construction.（4）Interaction: the focus of attention of Psychological research would be shifted from inner mental states to interpersonal relations and interaction.

Key words: social constructionist Psychology, criticism, construction, discourse, interaction.