Despite the launching of e-service by household registration offices, there have been few studies and examples associated with the organization streamlining. This study constructs a research framework for changes in Taiwan¡¦s first household registration office organization structure resulting from township/city consolidation, as well as the resulting work stress, and explores the correlation between members¡¦ cognition concerning their organization¡¦s merger and their work stress after the merger with organizations possessing similar functions. This study is a qualitative research, in which the staff members of Donggang Household Registration Office, Pingtung County, are taken as the subjects for in-depth interviews. Interview data analysis and research hypothesis are employed for verification. This case study focuses on structural change. An examination of the potential stress factors after organization structure change finds that, after the merger, the staff members did not have to learn new skills, nor were their work routines or workplace locations changed, in adapting to the new organization. Only high-level supervisors were impacted because fewer of them were needed after the merger. Accordingly, the merger of household registration offices with similar functions did not have a significant effect on work stress for most staff members.