We　report　fabrication　of　large-scale　homogeneous　crystallization　of　CH3NH3PbBr3　(MAPbBr(3))　in　the　patterned　substrate　by　a　two-dimensional　(2D)　grating.　This　achieves　high-quality　optotelectronic　structures　on　local　sites　in　the　micron　scales　and　a　homogeneous　thin-film　device　in　a　centimeter　scale,　proposing　a　convenient　technique　to　overcome　the　challenge　for　producing　large-area　thin-film　devices　with　high　quality　by　spin-coating.　Through　matching　the　concentration　of　the　MAPbBr(3)/DMF　solutions　with　the　periods　of　the　patterning　structures,　we　found　an　optimized　size　of　the　patterning　channels　for　a　specified　solution　concentration　(e.g.,　channel　width　of　5　mu　m　for　a　concentration　of　0.14　mg/mL).　Such　a　design　is　also　an　excellent　scheme　for　random　lasing,　since　the　crystalline　periodic　networks　of　MAPbBr(3)　grids　are　multi-crystalline　constructions,　and　supply　strong　light-scattering　interfaces.　Using　the　random　lasing　performance,　we　can　also　justify　the　crystallization　qualities　and　reveal　the　responsible　mechanisms.　This　is　important　for　the　design　of　large-scale　optoelectronic　devices　based　on　thin-film　hybrid　halide　perovskites.