Rheological properties of liquid crystal 4-pentyl 4'-cyanobiphenyl (5CB) were investigated using the picnometer technique and method of capillary viscometer and Stokes method in temperature interval from 298 to 333 K. Experimental data reveal a non-monotonic temperature behavior of the kinematics viscosity coefficient. It because that viscosity consist from regular and fluctuating parts. The fluctuating part is determined by anomaly development of order parameter fluctuations in the vicinity of the phase transition point. In nematic and isotropic phase it obeys power dependence. In nematic phase value of exponent of power is close to the value of critical parameter of isothermal compressibility for a liquids in the vicinity of critical point. In isotropic phase value of exponent of power is close to the critical parameters for correlation radius. It was shown that in the vicinity of phase transition point viscosity attains finite value.