We have developed the multi-sensing system for sensing an electric field and dcecomposition products by use of a nematic liquid crystal cell sandwiched between a pair of choresteric liquid crystal cells combined with the corner cube prism coated by a dye film. The electric field can be detected at the wavelength of the selective reflection of the choresteric liquid crystal. The decomposition gas can also be detected at the different wavelength region as spectra changes of the dye film deposited on the corner cube prism surfaces.