Professor Kitazawa recalls his earlier experience of studying and working both in United States and in Japan. He gives a detailed description about the research work of high Tc superconductivity in Japan from 1970 -1987, especially about some important events in the researcher of high Tc superconductivity that happened after the Bednorz and Muller discovery, which involved American, Japanese and Chinese scientists. He also gives some comments on the science policy and R&D of superconductivity in Japan, United States and China.
