Abstract: The topic of trust and cooperation has received considerable critical attention in the field of psychology over the years. The majority of research has focused on exploring the factors of trust and cooperation as well as effective strategies to stimulate trust and cooperation. Employing the “Removing the Sanction” paradigm, this study attempts to investigate the mechanism of how sanction affects trust and cooperation with different group identities. Here the independent variables are group identity and sanction conditions; the dependent variables are the trust and cooperation behaviors during the Public Goods Dilemmas.