Motivation The small body spin and finite size effect becomes more and more important when the mass-ratio g>10-3. 口卡三色至习QC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Motivation The small body spin and finite size effect becomes more and more important when the mass-ratio q > 10−3 . Our recent work is to consider the spin and finite size effect in IMRACs involving a HS BH. 1. The spin effect could be essential in the GW signal emitted from IMRACs if q ≥ 10 −3 , by preliminary numerical study Huerta et.al. 2011 2. The finite size effect has not been studied before 3. As the first step for further study in self-force formalism