IMRAC:intermediate mass-ratio coalescence Mc010-2-10-4. q一MBH In the literature,it was often termed intermediate mass-ratio inspiral (IMRI). 口卡4三色至习QC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMRAC: intermediate mass-ratio coalescence q = MCO MBH ∼ 10−2 − 10−4 . In the literature, it was often termed intermediate mass-ratio inspiral (IMRI). Two types of IMRACs: 1. Type I: the stellar mass compact object orbiting around IMBH 2. Type II: IMBH orbiting around a supermassive black hole in the center of galaxies