Water resources carrying capacity is a foundational topic in water resources security strategic study and the foundational measurement of water resources security.It is an index which refers to the system of society,resources and environment.It reflects the supporting ability of the water resources system for sustainable society development,and it is an important issue in the field of water resources research and sustainable development.In practice,water resources carrying capacity is a basic theory of local water resources exploitation.Therefore,through researching local water resources carrying capacity,we can not only understand the supporting function of the water resources system for social development,harmonize developmental relationships among the population,resources and environment,but also realize the social sustainable development well.Based on analyzing the available information,this paper discussed the conception and connotation of water resources carrying capacity.existing problems,and method of quantizing water resources carrying capacity.