With the extensive application of liquid crystal spatial light modulator, using liquid crystal spatial light modulator to generate vortex beams become more and more practical. Due to defects in the production process of reflective liquid crystal spatial light modulator, the quaility of the vortex beams generated by the reflective liquid crystal spatial light modulator is not perfect. An aberration compensation method based on Gerchberg-Saxton (GS) phase retrieval algorithm is put forward to overcome this shortcoming, after this aberration compensation, the quality (symmetry) of the vortex beams is improved. Furthermore, the method for the reflective liquid crystal spatial light modulator to generate all kinds of perfect vortex beams is explained in theory.