High technologies in Japan as electronics & computer, solar energy, nuclear power and space engineering & nature are introduced and presented as original papers. After graduating Kyoto University (Physics) and the University of Florida (Nuclear Eng. PhD), I experienced a boiling water reactor BWR as Fukushima #4 and nuclear instrumentation for LMFBR (Joyo, Monju) in Hitachi and Japan Atomic Energy Agency, as well as an advanced traveling reactor ATW and a nuclear fusion of D-3He plasma with pions ignited by antiproton. Furthermore studied were solar cell & thermal power generation as the sunshine project, electronics as quartz resonator & computer programming with PC, and spacecraft thermal design of international space station ISS with a super computer.