The recently developed coarse-grained (CG) molecular model enables us to investigate meso-scopic morphologies of self-assembly of amphiphilic molecules at the molecular level. The present CG model is designed to well reproduce the interfacial properties, solvation free energy, as well as molecular distribution obtained from simulations at the all-atomic detail. The transferability and versatility is demonstrated by applying the model to the bulk aqueous solution as well as to the air/water interfacial system.