Abstract: Based on the achievements made by national scientific and technological project and the relevant laws and regulatory requirements,as well as the actual safe production needs of the CNG filling stafions,the design scheme for the safety monitoring system of CNG filling station is proposed.Firstly,the common dangerous and hazardous factors of CNG filling station are identified,and the accidents happening in CNG filling station in recent years are statistically analyzed.Secondly,the fire and explosion hazards are analyzed with fault tree analysis method.Thirdly,the accident prevention measures are put forward.Finally,the structure and functions for safety monitoring system of CNG filling station ale presented.On the basis of the identification,analysis and evaluation of CNG filling station's hazardous factors,the safetyrelated information needing monitoring in the system is determined.Through the intelligent analysis on the safety information in the operation of CNG filling station,this system Call not only achieve the functions of early-warning and interlock control,but can also control and eliminate the risk of accidents and prevent major accidents.In addition,the system can be directly incorporated into the emergency rescue platform to provide detailed and accurate field information for the scientific decision-making of emergency rescue services.