Abstract: We have studied and verified that the UV absorption spectra of the charge-transfer complexes (CTC) formed by various aromatic amines as electron-donors with various electron-acceptors are closely related to their structures. Instead of forming peaks only some broadening of the absorption band was observed for the system composed of weak electron-acceptors and aromatic amines. Only strong electron-acceptors, such as tetracya-noethylene, showed a new peak when forming CTC with aromatic amines. The UV absorption showed peak increasingly larger bathochromic shift both with increasing electron-accepting power of the acceptors and with increasing electron-donating power of the aromatic amines, i.e. with electron-donating substituting group on the benzene ring or with more substituting alkyl groups on the nitrogen atom of the amine molecule.