Abstract: Complex service environments can cause the array surface of phased array radar to deform and thus reduce the detection power of the radar. With the continuous development of active phased array antennas towards large apertures, high frequencies and high gains, the influence of structural deformation on radar performance is more severe. Therefore, to ensure that the radar antenna can “see” more clearly and accurately, it is necessary to sense the array surface state in real time to compensate for the loss of antenna electrical performance. This paper proposes an array surface deformation reconstruction algorithm based on SCNs for high-frequency large-aperture land-based active phased array antennas. Firstly, the structure of the large-aperture land-based active phased array antenna is analyzed, and the main factors causing antenna structure deformation and the influence mechanism of structural deformation on electrical performance are pointed out. Then, an array surface deformation reconstruction model for active phased array antenna is established based on SCNs. Finally, the implicit relationship between structural strain and displacement is revealed through a large amount of experimental data, verifying that the proposed method meets the high-precision reconstruction requirements of the array surface of high-frequency antennas.