To extend the angular sweep range of optical phased array (OPA),the influence of the polarized birefringent prism (BFP) group′s structure on the performance of angular-contr olled ability is studied. Some main factors which limit the magnification and deviation efficiency are analyzed,and corresponding optimization methods are proposed.The results show that the di stribution of output beam directions is determined by the BFP group′s wedge an gle and incident angle,so BFPs′ wedge angles should be optimized to get wider sweep range and more propor tioned distribution.To obtain higher magnification,BFPs with bigger wedge angles shou ld be chosen,and more BFPs should be adopted,but these will be limited by the beam walk -off effect,so it is necessary to consider the requirements of minimum angle interval and caliber in the OPA application to make an integrated design.In the magnification system,the error in the manipulation of polarization is the main factor of stray light,so the driving voltage of liquid crystal wave plates should be strictly controlled.