From the Fraunhofer far-field diffraction theory and Dammann grating design principle, we used the phase modulation characteristics of the liquid crystal spatial light modulator (LCSLM) to design a 5×5 lattice-structured light pair phase grating. By considering the display of a two-dimensional Dammann grating, we used the simulated annealing algorithm to optimize the phase distribution value within one period of the grating with respect to the expected light energy utilization rate and light intensity non-uniformity. Thus, the beam splitting structure of the Dammann grating, which can form 5×5 lattice, is designed. Next, Matlab was used to simulate the far-field diffraction to obtain the light energy utilization rate and unevenness of light intensity reach 79.94% and 13.28%, respectively. The grating structure was loaded on the LCSLM, and a 5×5 lattice with 27.53% light intensity unevenness and uniform distribution of zero-order diffracted light intensity was obtained. Also, the light energy utilization rate reached 71.06%. Numerical simulation and optical experimental results prove that the LCSLM can clearly reproduce the lattice-structured light in the structured light reproduction optical system. Compared with the traditional structured light, the structured light designed in this paper does not change the distance between points when the diffraction distance changes.