Spectroscopic ellipsometry is widely used in measuring the refractive index and thickness of optical isotropic thin layers. A simple method using spectroscopic ellipsometry to measure uniaxial liquid crystal layer is introduced. A UVISEL spectroscopic phase modulated ellipsometer is used to measure the ordinary refractive index, extraordinary refractive index and thickness of the liquid crystal layer in a parallel-aligned liquid crystal cell. The phase retardation Δnd is measured in transmission mode. The results show that the spectroscopic ellipsometry can be used to measure the anisotropic multilayer liquid crystal cell with high precision.