Abstract: With the rapid development of economy, the demand of water resources in Hebei Plains is increasing rapidly, the groundwater is over-exploited and the cost of water for agriculture is increasing rapidly, which has a great negative impact on the economic development and ecological construction, it is imperative to save and use water efficiently. Water-saving policy is one of the effective strategies with low costs and direct effects. In this paper, through an in-depth and systematic study of the“Collect then Refund” water-saving policy in the actual implementation of the various problems, from the internal causes of system design, through the establishment of price increases, price increases and water-saving effect model, this paper estimates costs and benefits, studies the optimized countermeasures, and puts forward a new water-saving management mode of“One levy, one guarantee”, which is effective, fair, universal and operable, and can promote the optimal allocation of water resources, it provides theoretical basis and experience for the reform of agricultural water price in China, especially for the comprehensive management of groundwater over-extraction area.