Abstract: From 1950 onward, Beijing became one of the 39 cities in China where some North Korean workers were accepted and trained as interns. In this project of North Korean interns, the local government of Beijing followed every instruction from the central government and considered the whole program as a political task. It upheld the spirit of internationalism and provided these interns with care and convenience in every way, from their technical study to daily entertainment. When the local government of Beijing fell into a diplomatically passive position due to the leaking of new techniques, it placed priority on politics and generously made them available to North Korea for fear of damaging the two countries’ relations. The project of North Korean interns came out of the two countries’ agreement on the political objectives, and ended due to the deviation of their political ideologies. As an epitome of economic relations between China and North Korea, the project shows an influence that the political relation has exerted on the economic sphere, and also reflects a structural defect of the two countries’ relations.