Abstract: In this paper, a high power planar antenna without phase shifter is designed. This antenna realizes the function of space beam scanning through the phase distribution change of the aperture field via strata radiatum self-rotating, and realizes the requirements of light weight, and low profile integration. The gain of the antenna is 36 dB, the beam scanning range is from -30° to +30°, the power capability level is GW, the frequency range is Ku. We fabricated the antenna and tested its parameters, the results indicate that the antenna has high technical index in beam scanning and high aperture radiation efficiency. Compared with the traditional phased array antennae, this antenna can realize phase regulation, change the beam pointing without phase-shifted feed network, and it has the advantages such as simple servo, compact structure, low profile and low weight. This antenna can be applied to the surface conformal emission technique of the airborne, vehicular, shipboard high power weapon system.