The creation reasons of liquid crystal state have not explained up to now. This article is devoted for the elaboration a new solution of this problem. Author found the new calculation method of expression Σ(ri)2 which is a function of temperature, molecular weight and light wavelength. The Σ(ri)2 characterize the molecule of liquid and is connected with the distance polarizability tensor components αparallel1, αperpendicular1 by the formula. Σ(ri)2 = (Z ro)½ [(αparallel1)½/2 + (αperpendicular1)½]. For liquid crystal one can obtain two values of Σ(ri)2. First the Σ(ri)2To for the transition temperature To the isotropic liquid state of liquid crystal and second Σ(ri)2Tc for the transition temperature to the solid state of liquid Crystal. These quantities must to satisfy the relation Σ(ri)2To < Σ(ri)2Tc for all liquid crystals. If it is inversely the liquid does not possess the liquid crystal properties.