本文研究了以高温地热水为热源的超临界ORC系统工质筛选过程，基于Matlab软件开发了一种变夹点温差系统多目标工质筛选策略，依据热效率、总?损、净输出功率、工质传热系数、环保性能五种指标对系统循环工质进行筛选。对热源入口温度为290与260 ℃的超临界ORC系统分别采用R141b、R365mfc、R245ca、R1233zd为工质下的性能指标进行了计算。结果显示，R141b与高温热源匹配度较高，具有很高的热效率和净输出功率。热源入口温度为290 ℃时，推荐使用R141b作为工质，最佳综合性能对应热效率18.86%，净输出功率66.01 kW，工质传热系数2220.21 W/(m2·K)。R245ca的传热性能较好，若系统更加侧重于筛选传热性能较好的工质则推荐采用R245ca。R1233zd的环保性能显著高于其余工质，R1233zd在热源入口温度为260 ℃之间时具有最佳的综合性能，尽管在部分情况下其传热能力和做功能力弱于R245ca，但优秀的环保性能仍使得R1233zd具有很强的应用前景。

This study investigates the performance of supercritical Organic Rankine Cycle (ORC) systems utilizing different working fluids with geothermal water as the heat source. A variable pinch point temperature difference-based multi-objective screening strategy for working fluids was developed using MATLAB. The screening process evaluates the fluids based on five indicators: thermal efficiency, total exergy loss, net output power, heat transfer coefficient and environmental performance. The strategy enables the exploration of a broader range of operating conditions and provides tailored single-objective or comprehensive optimization results depending on specific performance goals, thereby offering greater adaptability. The system performance was then analyzed using R141b, R365mfc, R245ca and R1233zd as working fluids at heat source inlet temperatures of 290?°C and 260?°C, respectively. The results show that R141b is highly compatible with high-temperature heat sources, delivering excellent thermal efficiency and net power output. When the heat source inlet temperature is 290?°C, R141b is recommended, achieving optimal overall performance with a thermal efficiency of 18.86%, a net power output of 66.01?kW, and a heat transfer coefficient of 2220.21?W/(m2·K). R245ca offers superior heat transfer performance, making it the preferred option when heat transfer capability is important. R1233zd significantly outperforms the other fluids in terms of environmental characteristics, and its overall performance remains well when the heat source temperature is 260?°C. The outstanding environmental profile makes R1233zd a highly promising candidate for practical applications.