对城市雨水资源进行潜力计算与效益识别是进行城市雨水利用的基础，研究分析了目前常用的城市雨水资源潜力计算及其效益识别方法后，建立了改进的基于水量平衡的城市雨水利用潜力分析模型及功能与需求耦合效益识别模型。之后利用云南省某市建成区1956-2015年水文资料及统计年鉴资料，通过以上两个模型计算分析出了该区域年平均雨水利用潜力为537.29万立方米，2020年雨水资源化利用潜力的效益因子识别结果为：工业需水、城市供水、生态需水和补充地下水。结果表明：改进的基于水量平衡的城市雨水利用潜力分析模型有效，计算结果与实际情况更加接近；功能与需求耦合效益识别模型对于城市雨水利用的效益因子识别更加精确。

Considering that the calculation of urban rainwater utilization potential and benefit identification are the first step in urban rainwater utilization，the commonly used methods of urban rainwater utilization potential calculation and its benefit identification are studied in this paper． After that，an improved model of urban rainwater utilization potential based on water balance and the coupling function identification model of function and demand are established in this paper． Based on the data of rainfall and statistical yearbook from 1956 to 2015 in a city built area in Yunnan Province，the above two models are used to calculate the average annual rainwater utilization potential of 537．29 million cubic meters and the benefit factor of rainwater resource utilization potential in 2020 include industrial water demand，urban water supply，ecological water demand and supplementary groundwater． The results show that the improved model of urban rainwater utilization potential based on water balance is effective and the factors are comprehensive and the physical process is clear and the results are closer to reality． Because the function and demand coupling benefit identification model can avoid duplication or omission of benefit identification，the benefit factor recognition is more accurate．