The article is devoted to the problems of the formation and development of military Japanese studies in the early 20th century. Its relevance is related to the fact that current problems of the Russian-Japanese relations are rooted in the political confrontation and numerous wars and armed conflicts between the two countries which erupted in the first half of the 20th century. The military have joined Japanese studies since its establishment in Russian higher education. Officers of the units of the Russian army stationed in the Far East studied Japanese and Japan together with university students - in early 20th century the ratio of military and non-military students was almost 50:50. The first military specialists in Japanese studies either gave priority to research and education over military service, or successfully combined both. Joint training of officers and university students had a great impact on all aspects of life and work of the Oriental Institute, while causing criticism from both senior faculty managers and the high-ranked Russian military. Despite great success in the officers’ training at the Oriental Institute, the initial system of Japanese studies training was reformed, though its principles and traditions were preserved until the 1917 revolution. The article was written on the basis of archival and published documents of the Oriental Institute, with the usage of academic works of the first Russian officers specializing in Japanese studies. The historical experience of the Japanese studies education and research is interesting and relevant for today’s Russian-Japanese relations.