The authors of the paper hold that a better understanding of rainwater. resources and rainwater cistern systems will be further facilitating prosperity and developing context of rainwater cistern systems. The paper, approached from the view point of rainwater and rainwater process, raises a general conception system of water resources based on rainwater resources, reveals the role of rainwater on control of total amount of regional water resources, expounds relationship of mutual transformation and derivation among water resources of differing forms, and provides theoretical basis for scientific, rational and new water resources evaluation and sustainable development. It attempts to give a broader definition on rainwater utilization, based upon which to turn rainwater cistern utilization into an independent branch in water science.
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