Based on the domestic and overseas research of watershed environment management techniques,the technology system of water quality target management for the control units was presented and the connotations and characteristics were discussed in this paper. Meanwhile, seven key techniques of the system, including the division of control units, environmental problem diagnosis, identifying of water quality objectives, construction of water quality models which is used to establish the response relationship between water quality and pollutant input, pollutant load allocation, pollutant emission reduction program, and pollutant load monitoring and evaluation are introduced. As a case study, the technology system of water quality target management for the control units was applied in Nansha River in Liaohe River basin successfully, and the total load allocation program was given, which can be used to provide technical support for the local water environment management.