Dam safety monitoring is an effective means and method for people to understand the operation and safety of dams. Its main purpose is to understand the safety status and development trend of the dam, which is a whole process from obtaining various environmental, hydrological, structural and safety information to identification, calculation and judgment, and finally giving a dam safety degree. This process includes: by obtaining, sorting out and analyzing all kinds of information, giving dam safety evaluation, controlling the accuracy of calculation parameters and practicability of calculation methods for dam safety operation, feeding back the correctness of construction methods, improving construction methods and construction control indicators, providing field data for scientific research, testing various theories, correcting various models and parameters, helping to find out the measured laws and assisting cause analysis.