The reasons for the poorness of psychological researchos and activities on the union relations were the union leaders distrusts of I/O psycologists and clinical pychologists and their lack of understanding about psychological services of union management. The important psychological studies and activcties were introduced, and research themes were discussed. According to the process of collective bargaining, the psychological suggestions and legal aspects of the negotiation preparations, issue developmentation of labor contrats were introduced and suggested. The use of job satisfaction survey in issue developments and further researches about the union commitment for the supports of union member were particularly important for the effective union management. The convincing psychological research themes were the traits and charateristies of the negotiators, the situational negotiation factors and the development of negotiation technigues. The frustration of power needs had influence on the radical union activities.