The effects of the radius of the circle, the length and width of the rectangular and the width of the nano-slit on extraordinary optic transmission of metallic circle -rectangular compound hole array with nano-slit coupling are investigated using the finite-difference time-domain method. The results show that, compared to circle hole array and circle-rectangular compound hole array, the transmittance of the optical transmission for the structure is significantly increased, which suggests that coupling effect of surface pasmon polartion and localized surface plasmon by nano-slit is the key role. The main factor that affects the optic transmission is the width of the nano-slit, and the transmittance is 89% and the full width at half maximum is 129 nm when the width of the nano-slit is 55 nm; the parameters such as the radiusm The effects of the radius of the circle, the length and width of the rectangular and the width of the nano-slit on extraordinary optic transmission of metallic circle -rectangular compound hole array with nano-slit coupling are investigated using the finite-difference time-domain method. The results show that, compared to circle hole array and circle-rectangular compound hole array, the transmittance of the optical transmission for the structure is significantly increased, which suggests that coupling effect of surface pasmon polartion and localized surface plasmon by nano-slit is the key role. The main factor that affects the optic transmission is the width of the nano-slit, and the transmittance is 89% and the full width at half maximum is 129 nm when the width of the nano-slit is 55 nm; the parameters such as the radius