From the viewpointofsafety technology ofchemicalreaction with heatrelease.thetech nicalcauses ofgetting outofcontrolofthese reactorsare analyzed.Hazardous effects ofthe leakage ofchemicalreactants both on human and environment,and the existing problems in currentsafety technologicalmeasures are also discussed.The cooling method ofjetvaporiza tion based on thejetprincipleand thedirectcooling by non-vaporized liquid areintroduced. The developmenttrends ofthe safety technology forchemicalreactors are an...