The paper introduces a kind of modified Wollaston Prism

including its wedge angle

γ

thickness

ω

optical axis inclination angle

δ

and the formulas of designing the optical system based on these parameters. Using Matlab software developed by the authors

two relational expressions indicating the inflection of the wedge angle and the optical axis inclination angle both on the splitting angle

ε

and the plane of apparent splitting inclination angle

η

were calculated. By analysing the result

some useful conclusions were obtained

and the limitation of the original Wollaston prism was conquered

therefor

extending its applications.