Abstract: In order to get a symmetric beam splitting prism,the conventional Wollaston prism was modified,i.e.to modify the surface of o light and get symmetric beam splitting.The relation between the correction angle and prism's structure angle was given.Taking 632.8nm for example,the relation curve between the correction angle and prism's structure angle was obtained.Furthermore,the relation curve between the correction angle and wavelength was also obtained.The results indicate that this design can get symmetric beam splitting and it is simple and easy to process.