快慢车模式作为满足市域线路快速、高效运输需求的主要手段之一，既有能力折损计算原理及公式存在 较大误差。为提升计算精度及适用范围，在总结概括既有研究成果的基础上，通过引入均匀度参数，描述快慢车 发车均匀性与系统能力间的对应关系及变化趋势；在保证均匀性的前提下，对不同快慢车模式的能力折损公式进 行优化总结；最后结合运行图实际铺画效果，验证公式的准确性和可靠性。结果显示，优化后的能力折损公式可 显著提升计算精度及适用范围，能够为相关项目提供参考。

As one of the main methods to meet the need for rapid and efficient urban rail lines, express and slow train organization modes are important. However, the calculation principle and formula for the system capacity loss showed some errors. To improve this, the corresponding relationship between departure uniformity and capacity loss was described by introducing a uniformity parameter based on the summary of existing research results. The capacity loss formula under the slow and fast modes was summarized and optimized with the premise of uniformity. The accuracy and reliability of the formula were verified using a running chart. The results showed that the optimized capacity loss formula significantly improved the calculation accuracy and application range, and could provide a reference for related projects.

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