The harmonious development of human and water is an important requirement for water resources development set forth by sustainable development. Taking the human-water relationship in Erenhot as a research subject, the evaluation index on water resources and economic society development of Erenhot has been established according to the total water intake, water use efficiency and water environment protection. The result shows that the harmony degree between water resources and economic society development of Erenhot has improved significantly since constructing the water-saving society The evaluation system is feasible and can provide reference for the construction of water-saving society in the northern areas of China which is short of water.