Substrate manufacturing method and multi-layer stack structure

A substrate manufacturing method includes steps of: providing a transparent hard substrate; applying an adhesive layer to a surface of the transparent hard substrate; laminating a flexible substrate to the adhesive layer to form a multi-layer stack structure; disposing the multi-layer stack structure over the reflector, in which the reflector has a first reflecting region and a second reflecting region, and the reflectivity of the first reflecting region is greater than the reflectivity of the second reflecting region; and emitting an ultraviolet light toward the multi-layer stack structure, so as to harden the adhesive layer to be a first hardened region and a second hardened region.