The experimental values of the complexes of the dipolar increment of Benzaldehyde, 2- Fluorobenzaldehyde,4-Fluorobenzaldehyde with 1-Octanol in Carbontetrachloride were studied at 303K. The dipole moment of the complexs has determined by Huysken’s and Debye’s polarization based on the Onsager theory. The results shown that complexation is used to discuss the molecular interaction. The increment of the dipole moment were obtained from bond angles data