Following the previous report on the industrial manufacture of polyethyleneglycol by Wurtz' reaction and by the diethyleneglycol-ethylene oxide reaction, attempt was made to remove the weak point in these methods, i.e. the necessity of high temperature, high pressure and a long period of time. It was found that the reaction could be promoted by the use of amines as a catalyst. The amines tested included aniline, dimethylaniline, pyridine, triethylamine and ammonia, all of which succeeded in promoting the reaction by the lowering of reaction temperature and pressure, and shortening the reaction period. Moreover, the presence of the catalyst did not have any effect on the system of products, giving a good yield. The amines were found to have different catalytic action, triethylamine and ammonia being the strongest, followed by pyridine and dimethylaniline, with aniline being the weakest. With one kind and a definite amount of the catalyst, the reaction speed was in proportion to the temperature. The component of the product remained constant, being independent of the temperature. In short, amines possess excellent catalytic action in the manufacture of polyethylene-glycol.