Abstract: Quantitative assessment for regional rainwater harvesting potential is very significant for macro decision-making and comprehensive planning of regional rainwater harvesting. Taking the Loess Plateau as a sample region and rainwater resources as research object, the influence factors of regional rainwater harvesting potential were analyzed systematically. Quantitative assessment indices of regional rainwater harvesting potential were defined. And the data with different origins, different scale and different types were integrated using GIS technique. Quantitative assessment model for rainwater harvesting potential was established. The assessment model plays an important role for sustainable utilization of rainwater resources and eco-environmental protection in the Loess Plateau.