A set of liquid crystals and polymer complex (LCPC) films which have different polydomain focal conic textures and different polymer wall were prepared. The electro-optical properties of cholesteric liquid crystals and polymer complex were investigated using OS - 6411C Digital Storagescope with He-Ne laser and candescent light. These LCPC films may have various threshold-voltage, electro-optical response time and contrast ratio which depend on LCPC's composition, especially the focal conic liquid crystal textures in polymer matrix and polymer wall effect. Among these, the best LCPC film was developed which has a very low driving-voltage, quick response time and high contrast ratio. The results reveal that the cholesteric twisting power and polymer wall effect are most important factors for electro-optics of LCPC films.