Chemical industry originated in Alchemy had greatly developed in Europe through primary industrial revolution and in the U. S. A. chemical engineering has been developed. After the second world-war, reaction engineering has been commenced to develope. I don't know a precedent which reaction.fields was discussed in view of the chemical industry, then I present herewith a brief essay in the fields of high temperature cracking reactions, solid surface reactions, chemical ray reactions, electro-chemical reactions, matrix polymerization and interfacial polymerization, high pressure reactions, etc.