Abstract: Public trust and citizen participation are important issues interrelated in the public domain, and their logical relationship is not simply unidirectional linear. Take public trust as the premise of and purpose, this paper aims to explore the citizen participation in public trust within limited border, and how to effectively develop and improve the public trust. Based on the preliminary analysis and adjustment of the connotation of the relation between the two issues, the theoretical framework can be formed. In the theoretical framework, public trust frames the boundaries of limitation, orderliness and effectiveness in civil activities, and proposes the approaches to cultivate public trust in practice, such as the breakthrough of limited information, the cultivation of citizen consciousness, the variety of institutional designs and the access to public interest.