Abstract: In this paper,by means of Jones matrix calculus a system of four birefringence lenses and a polarizer used for spatial pulse shaping has been studied,including the intensity transmittance distribution and performance properties of the system.The parameter selection in practical design and the effect induced by fabrication error are discussed.The results show that the use of birefringence lenses is easy to change the transmittance function and suitable to get the spatial shaping of the line polarized Gaussian beam.