This study aimed to explore the role of smart assistants in alleviating knowledge asymmetry in interdisciplinary group discussions. Due to diverse disciplinary backgrounds and foundational knowledge differences, group members struggle to engage effectively in group discussions. To address this issue, we introduced a smart assistant named CaseAssistant, designed to provide relevant information for discussions, thereby promoting cognitive consensus among participants. Through qualitative research, including user interviews, semi-structured group discussions, and observer feedback, we deeply analyzed the impact of CaseAssistant on enhancing discussion efficiency, reducing participant workload, and expanding the depth and breadth of discussions. The findings indicate that the introduction of smart assistants can lower the workload of group members, promotes cognitive consensus, and effectively improves the quality and efficiency of group discussions.