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This letter present a high efficiency transmitarray antenna using a four layers of double split rings slot structure as the unit cell element. The transmission coefficient of the element at different incident angles are analyzed by Ansoft HFSS and the results show that the element has the advantages of low transmission loss and less sensitive to the incidence angle of electric field. A high-efficiency transmitarray antenna composed of four layers of double split rings slot elements is designed, manufactured and tested at Ku band. The diameter of transmitarray antenna is 6.76 wavelengths, the measured gain is 23.9 dB. Radiation efficiency of 77.6% and aperture efficiency of 55% are achieved at center frequency of 13.58 GHz in this design. The measured 1-and 3-dB gain bandwidths are 7.4% and 17.7%, respectively.Index Terms-high efficiency, double split rings slot element, transmitarray antenna.