Abstract: The high-contrast 1D and 2D periodic microstructures of photonic lattice were formed in a photorefractive crystal by using the coplanar multiple-beam interference method. The distribution regularities and influence factor of periodic microstructures by interference of the coplanar of two or more beams intersecting at a photorefractive crystal were investigated experimentally and theoretically. The universal mathematical model of coplanar multiple-beam interference was established on the base principle of interference optics, and the light intensity distribution with n(n=1, 2, 3, 4, 5, 6) beams interference was simulated by computer. In the experiment, the coplanar multiple-beam interference was used to fabricate interference pattern and generate photonic lattice. The results show that it is quite consistent with the simulation results. The effect of various factors on characteristic in coherent system was further discussed. Interference pattern formed by coplanar multiple-beam laser was used to illuminate ferroelectrics lithium niobate crystal, then microstructure of photonic lattice was fabricated in the crystal due to holographic recording.