||One of the most important elements in the LCDs is the polarizer film. In particular, the coatable polarizer is becoming a promising alternative for conventional H-sheet polarizer in LCDs. In this study, we aim to develop a coatable polarizer based on the “host-guest” system, in which a polymerizable reactive mesogen with highly ordered smectic phase is used as the “host” material, and a dichroic dye is act as the “guest” material. After spin-coating and annealing processes, the sample was cured by ultraviolet light. However, there was a dramatically decrease in DR values during the UV polymerization process. In order to address this problem, it is necessary to minimize the degradation of DR value by optimizing the formation of the “host-guest” mixture. We proposed and described several methods to optimize the “host-guest” mixture to improve the optical properties. It was confirmed that the polarizer sample exhibited improved optical properties by adding a designed additive.