Hot-embossing experiments were conducted on poly (methyl methacrylate) orthogonal arrays with base widths of 1μm, 3μm, 5μm, 10μm, and 50μm. The relationship between the base width with respect to average molecular weight and number average molecular weight of micropattern were also investigated. It was discovered that the average molecular weight and number average molecular weight decreased as the base width increased.