The aberration properties of optical systems with large tilted and decentered plane-parallel refractive plate system and wedge system were analyzed with a new primary aberration analysis method for non-coaxial optical systems,i.e.vector aberration theory. Comparing with an exact ray trace using a computer design program for non-coaxial optical system with the theoretical third-order predictions,it is shown that the results are in good agreement.So it proves that the vector aberration theory is good for analyzing and designing optical systems with large tilted and decentered components.