极端质量比例旋（EMRI） 是一类由超大质量黑洞与较小致密天体组成的天体系统，能释放低频引力波，是未来空间引力波探测任务如LISA的核心目标 。
这类系统通常形成于星系中心，当一个质量在 106106 到 10101010 倍太阳质量之间的超大质量黑洞，通过引力作用捕获一颗恒星级致密天体（如白矮星、中子星或恒星级黑洞），使其进入高度偏心的轨道 。随着引力辐射持续带走能量和角动量，该致密天体将经历长达数年甚至数十年的缓慢旋近过程，终可能被黑洞吞噬 。
EMRI的独特之处在于其极端的质量比，导致轨道演化极为缓慢，引力波信号持续时间长且频率稳定在毫赫兹范围，这恰好落在空间引力波探测器LISA的敏感频段内 。这些波形携带了关于黑洞时空结构的精细信息，可用于高精度测量黑洞质量与自旋，并检验广义相对论中的“无毛定理” 。
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