The level of Carrying Capacity of Water Resources is an important factor to evaluate the condition of a region social，economic and ecological environment comprehensive and sustainable development.Water efficiency coefficients are different in different states，the carrying capacity of water resources is different too.This paper is based on analyzing the meaning of water resources carrying capacity，take water resources of the midwest of Shenzhen city as an example，by the way of the “Coordinated and sustainable development” theory，found the model of the carrying capacity of water resources，calculated and analyzed.The results show that the water resources in the midwest of Shenzhen city can only meet now this stage(2015)Urban water demand.At the same time，as the number of cities we increasing.In the long run，the water consumption in the midwest of Shenzhen must be regulated jointly by the reservoir group and the eastern river and the western diversion.In order to improve the water resources carrying capacity of the region.