Electroopic properties of LC-Aerosil-Photopolymer composites are studied in a wide concentration range of the mixture components. The main results relate to the dynamic parameters describing response to an applied electric field. An increase of the aerosil content results in a decrease of the rise and decay times (except samples with PDLC morphology), whereas an increase of the concentration of photopolymer causes an increase of these parameters. Variation of the transmittance, caused by an alternative voltage consists of alternative and direct components depending on the frequency of the applied voltage. The obtained results are explained based on the structural peculiarities of the LC-Aerosil-Photopolymer composites. The set up designed for the electrooptic measurements is described.