Abstract: The major environmental pollution accidents have occurred frequently in China and there is an increasingly urgent demand of environmental risk management. Aiming at the current status of lacking systematic analysis and classification of environmental monitoring technologies for risk sources, the monitoring technology library of key environmental risk sources was systematically studied. Based on the collection of data and the analysis of existing pollutant monitoring technologies and principles, and combined with the mature equipment information, the technology library was designed in terms of monitoring technology indicators, parameters, principles, technical methods and equipment selection, etc. This library can provide sound technical support for China's environmental risk management.