All along

disastrous fire and leakage in tunnels are important problems about safety and health of tunnels. It is first time that single distributed optical fiber is applied in predicting disastrous fires and early-warning

as well as orienting fires and leakages

which is based on the technical characters and advantages that the Distributed Optical Fiber Temperature System（DTS） can realize monitoring in real time and on-the-spot surveying temperatures distribution along optical fibers’ length. This paper introduces the principles of testing temperatures and testing results. The results show that DTS is accurate in testing temperatures and has good anti-jamming ability

especially fit to predicting and early-warning of disastrous fires and testing leakages

which has fair social benefits

economic values and good foreground.