Abstract: The Brillouin Optical Time-domain Analysis(BOTDA) is one of the new distributed optical fiber sensors with the functions of distributed monitoring,high accuracy,long span,real time,long-range control,etc.More and more engineers pay much attention to this new technology.Combining a certain project of karst collapse monitoring,the distributed optical fiber monitoring system based on GIS technology is developed.The system which integrates intelligent analysis and decision management into the multif...