Tonghu lake water plant is one of the water plants constructed by AWS with advanced technology in the world. It is the first time that water treatment technology of high efficiency sedimentation reaction pool is applied in guangdong province. In order to improve the quality of effluent, a carbon filter is added for deep treatment. The water plant is also the first large-scale drinking water purification plant in huizhou city to adopt the "ozone-biological activated carbon" deep treatment process. After these treatment processes, the water output of the plant is superior to the national standard, effectively guaranteeing the safety and requirements of local residents' water use.