A hybrid multi-beam spiral scanning method for deep-space exploration antennas is proposed, which can be used to estimate the true spacecraft position. Physical optics is used to compute and analyze the far-field pattern of the antenna for excitation of each of the individual array elements. The utilization of a focal-plane array in place of a standard single-mode feed improves the field of view of large high-frequency antenna. Multiple closely overlapping beams are synthesis with conjugate field matching technique. Results show that, combined with spiral scanning method, the multiple beams reflector antenna can reduce the scanning time by one third, and the array gain in multi-beam reflector antenna can improve the distance of deep-space exploration.