Environmental monitoring takes the environment as the object and uses physical, chemical and biological technical means to conduct qualitative, quantitative and systematic comprehensive analysis of pollutants and their related components, so as to explore and study the change law of environmental quality. In general, China's environmental monitoring can be basically divided into two categories: environmental quality monitoring and pollution source monitoring. Environmental quality monitoring is divided into air, water, noise and soil; The monitoring of pollution sources mainly refers to the monitoring of sewage facilities such as industrial enterprises and sewage treatment plants, which are mainly divided into wastewater, sewage, waste gas and heavy metals. At present, China has formed a government environmental monitoring network, covering many fields, such as surface water environmental quality monitoring network of main urban water bodies, automatic air monitoring stations in key cities, acid rain monitoring points, dust storm monitoring stations, pollution source monitoring network and so on. At the same time, China's coastal waters have also built an environmental monitoring network. China's environmental monitoring work is in the stage of rapid development. The environmental online monitoring system is still in the stage of large-scale construction, and the coverage will continue to expand. At the same time, the industrial chain division of environmental monitoring industry is gradually taking shape. Most enterprises focus on the manufacturing and system integration of automatic monitoring equipment for pollution sources, and have formed a number of distinctive and powerful enterprise groups in spare parts supply, system integration, equipment manufacturing and operation services. Some equipment manufacturers in other fields at home and abroad have also joined the monitoring instrument industry in, special component analysis equipment Manual comparison equipment and other fields have developed well.