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A three-dimensional chiral metamaterial with four-fold rotational symmetry is designed,and its optical properties are investigated by numerical simulations.The results show that this chiral metamaterial has the following features:high polarization conversion,perfect circular dichroism,and asymmetric transmission of circularly polarized light.A comparison of the results of chiral metamaterials without and with weak coupling between the constituent nanostructures enables us to confirm that the optical properties of our proposed nanostructure are closely related to the coupling between the single nanoparticles.This means that the coupling between nanoparticles can enhance the polarization conversion,circular dichroism,and asymmetric transmission.Due to the excellent optical properties,our metamaterial might have potential applications in the development of future multi-functional optical devices.