R and D on the production technology of hydrogen by biotechnology is one of the effective projects for worldwide energy supply technology and global environment protection technology in the 21st century. The research trend of various institutions promoting R and D on production technology of biohydrogen in the U.S.A. and other countries was surveyed together with the possibility of international cooperation. The production technology of biohydrogen is being watched over the world. Various researches are in promotion corresponding to environmental conditions as follows: search of not only photosynthetic bacteria but also such bacteria with hydrogen productivity as algae and anaerobic bacteria, and the gene engineering study for improving the hydrogen productivity of target microorganisms. All the institutions visited for this survey have great expectations in wide cooperative study in the future. On the possibility of international cooperation on the production technology of biohydrogen, the further precise survey should be promoted for developing more effective technologies based on the previous survey results. 156 refs., 10 tabs.