Both nonreciprocal birefringent effect and variable polarization effect of microwave ferrite in the symmetrical four-pole magnetized field are discussed in the light of coupling-wave theory. A concept of the tensor permeability in the multicenter-magnetized inho-mogeneous magnetized systems in a latching state is proposed. Two methods of variable polarization are discussed

and some formulae for wave-mode differential phase

nonreciprocal phase and variable polarization coefficient are deduced. The experimental results are in good agreement with the theoretical calculations.