The toxicity of rongali te(formaldehyde sodium hydrogen hyposulfite)added in food is analy zed in this paper. Bleaching, antico rrosion,antioxygentation and possible toxicity of sulfite acid and sulfite used in food industry are surveyed.

More attentio ns w ere paid on the research, exploitation and use of solar cell by many countries inthe w orld. Stimulated by a series of impo rtant discoveries in science frontiers and "new thougnt, new science,new technology" solar cell has received a fast development. Its exploitation and application can offer human soci-ety clean(g reen)energy. It plays an important role in the development of civilization and im provement of humansociety.

The study and design of g reen chemistry w ill realize the goal that reduce neg ative impacts even no harmful to human health and the environment. The methods include microscale laboratory, semimicroscale technique, microw ave chemistry and computer-aided desig n in g reen chemistry ex periment.

The school system in Japan is more or less similar to other part of world: 6 years elementary school, 3 years middle school, 3 years high school, and 4 years university undergraduate. The master course is 2 years after the g raduation, and a P hD candidate usually sends 3 years after the master degree.