Abstract: On the basis of reviewing the relevant technical specifications and practical experiences on dam safety monitoring at home and abroad, the overall evaluation framework of dam safety monitoring system is put forward in this paper. The evaluation elements and methods of the reliability and completeness of the dam safety monitoring facilities, the operation and maintenance of the monitoring system and the automation system are carried out. The evaluation of the dam safety monitoring system includes the evaluation of the completeness of the safety monitoring facilities, the evaluation of the operation and maintenance of the monitoring facilities and the evaluation of the automation system. Based on the verification data of the monitoring facilities, on-site detection and testing, and historical measurement analysis, the monitoring facilities are evaluated whether it is meet the requirements of the dam safety monitoring. The evaluation of operation and maintenance of the monitoring facilities includes operation management guarantee condition, observation and maintenance, data compilation and analysis, etc. The evaluation content of the monitoring automation system includes data acquisition device, computor and communication equipment, information acquisition and management software, operation conditions and operation maintenance, etc. The comprehensive evaluation of the monitoring system can be divided into three levels: normal, basically normal and abnormal. If the evaluation of the monitoring system is normal, it should continue to operate; if the monitoring system is evaluated as basically normal, it can continue to operate, but it should be repaired and perfected in time; if the evaluation of the monitoring system is abnormal, it needs to be updated and reformed in time.