Abstraction reaction of hydrogen atoms on a hydrogenated diamond surface was performed with benzoyl peroxide. In this study, we used the various solvents, such as toluene, acetonitrile, tetrahydrofuran (THF), N, N-dimethylformamide (DMF), cyclohexane, and n-hexane, and confirmed that (1) the radical species generated from the benzoyl peroxide extract the hydrogen atoms on the diamond surface, (2) the reaction rate for the abstraction of the hydrogen atoms from the diamond surface depends on the kinds of solvents, (3) the species of the functional groups produced in the radical reaction is independent of the solvents except for acetonitrile. In order to investigate the abstraction reaction of the hydrogen atoms on the diamond surface with benzoyl peroxide, experiments to determine the dependences of the hydrogen abstruction on the amount of added benzoyl peroxide and on the reaction time were conducted in toluene. The intensity ratio of the peak assigned to the C-H bond to that assigned to the two-phonon peak (I_C-H/I_two-phonon) was calculated to discussed the abstraction reaction quantitatively. The reaction rate was estimated from the I_C-H/I_two-phonon values.