To investigate the dynamic solvent effects on the formation of the "twisted intramolecular charge-transfer (TICT)" state, the pressure as well as temperature effects on the fluorescence spectra of 4,4’-diaminodiphenyl suIfone (DAPS) in alcohol solvents were examined. It is concluded that sol;rent viscous friction makes an important contribution to the rate of TICT-state formation of DAPS in alcohols. The contribution of the dynamic solvent effect on the kinetics is well-separated from that of the intrinsic static contribution defined by transition-state theory (TST). The contribution of the solvation effect to the activation volume and activation energy of the TICT-state formation is also discussed.