Three quantities characterising a liquid crystal molecules were voted to study their physical properties. The (α∥-α⊥) of liquid crystals investigated is almost constant at all range of mesophase, but they have a different values for each molecule of liquid crystals. It prove the change of molecule core of liquid crystal influence on their polarizability tensor components. The subject of this work was a three liquid crystal of CB 7, PCH 7 and CCH 7. Molecule core change has clearly influenced on the values of (α∥-α⊥). Components of polarizability tensor of molecule α∥, α⊥were calculated too.