A robust literature on the professional advancement of Chinese officials has paid comparatively little attention to an important elite group: the foreign policy bureaucracy. We introduce original data documenting over 11,000 career assignments of 1,357 senior officials in the foreign ministry from 1949 to 2023 and leverage these data to offer the first systematic analysis of who rises to the top of China’s foreign affairs system. We find that diplomats who spend a greater share of their careers in postings abroad are less likely to be promoted to higher ranks than diplomats who remain at home – and that these patterns persisted even after the professionalization of the foreign affairs bureaucracy. Meanwhile, the analysis finds only mixed evidence that diplomatic performance assists promotion. The data and analysis draw attention to the unique challenges of professional advancement in bureaucracies charged with managing China’s foreign relations.