Conjugate Dammann grating based on coherent beam combining technique that combines and aperture-fills a phase-locked two-dimensional laser array is an effective way to obtain high-power and high-beam-quality laser with single lobe in the far field. Here, this technique is applied to the coherent beam combining of two-dimensional phase-locked solid-state laser array. Theoretical analysis and experimental verification of a large aperture 5×5 solid-state laser array beam combination are described in detail. The beam combining efficiency of the system is measured. The influence of the manufacturing and positioning error of the grating on the beam combining efficiency is also measured and compared with theoretical analysis. Results show that this technique is very suitable for large-aperture solid-state laser array combination. By adjusting the period of the conjugate Dammann grating and the focal length of the Fourier lens, this technique can be used in systems of different duty circles. It is of great significance to the development of high-power, high-beam-quality solid-state laser systems.