Using Stokes parameter,the theories of production of left-handed rotation and right-handed rotation are analyzed.A new method of turning left-handed rotation into right-handed rotation is derived.

• 利用斯托克斯矢量法分析了左(右)旋偏振光的产生原理；并由此推导出了将左(右)旋偏振光调为右(左)旋偏振光的新方法.