The optimization of radar optimal receiving filtering for random polarization interference is studied.When the polarization mode of the random polarization interference is close to that of the target echo

while jamming signal is filtered and at the sametime

the target echo signal is inhibited by the traditional adaptive polarization filtering method

which leads to reduction of signal to interference noise ratio（ SINR）. A method of the joint of receiving and transmitting for polarization filtering is proposed to solve this shortage. The loss of target echo signal can be avoided by changing the polarization mode of target echo signal through the change of the emission polarization ones. The new method can get better signal to interference noise ratio than the traditional ones. The validity and feasibility of the joint of receiving and transmitting polarization filtering method is proved by the simulation results.