Abstract: Using the simulator Ansoft HFSS, the differential phase shift of the circle polarized ferrite phase shifter is computed by variant theories. These results accord with each other。In the case of uniform bias, the circle polarized phase shift and reverse magnetizing phase shift are computed using numerical integral method. And the reciprocity of circle polarized phase shift is proved. In the case of non-uniform bias, the infection of transverse magnetization to the polarization characteristic and phase shift is discussed.