Abstract: The polarization response of THz wavelength metamaterials modulators were studied, and two special modulators structures were proposed and simulated: the center cross structure and twins split ring structure. Compared with the traditional split ring resonator modulators which were all polarization sensitive, the new two structures had properties of polarization insensitive. The center cross structure was a completely symmetrical metal structure and had the perfect characteristics of the polarization insensitive. For the twins split ring structure, they didn' t achieve polarization insensitive completely, but the difference of THz polarization transmittance curves could be negligible. The surface current distribution of twins split ring structure was aslo simulated, and two main transmission mechanisms for the generation of two resonant absorption valleys were presented.