Japanese foreign policy of mass culture began in 2006，when Ministry of Foreign Affairs began to promote mass entertainment overseas，represented by manga，animation，and video game. Japanese manga，animation，and video game have long been widely disseminated among teenagers around the world，but because they are considered a low-level culture in mainstream Japanese society，they were not originally part of the official promotion of cultural exchanges. At the beginning of the 21st century，with the spread of the theory of soft power，mass entertainment such as manga，animation，and video game have attracted the attention of various functional departments，and Ministry of Foreign Affairs has also begun to use them as a soft power resource and diplomatic asset. The goal of Japanese foreign policy of mass culture is to take advantage of the high popularity of manga，animation and video game to cultivate people，who “know Japan” and “pro-Japan” in various countries in the world，so as to enhance presence and influence of Japan in the international community. However，the relationship between Japan and South Korea and other neighboring countries in recent years shows that the effect of Japanese foreign policy of mass culture is minimal.