Taking Erdos City as an example, with regard to the problems of rich mineral resources, deficient water resources, fragile ecological environment and serious contradiction between water supply and demand in the area, the techniques of utilizing nonconventional water are studied and the unified allocation and joint scheduling of various water sources is proposed by analyzing a variety of available quantity of nonconventional water resources. The results show that the conventional water resources (surface water and groundwater) in Erdos City are limited, and the available quantity of nonconventional water resources can be 331 million m3 in 2020 through the integrated utilization of reclaimed water from wastewater treatment, coal mine water, brackish water from desalination treatment (salinity of 2～5 g／L), exploited karst water, underflow and rainwater. It can effectively increase the available water supply in Erdos City and mitigate the contradiction between regional water supply and demand so as to support the sustainable development of social economy. The proposed strategy of nonconventional water utilization is of reference significance for the waterdeficient areas in Northwest China.