The invention discloses a siloxane priority with cinnamenyl chromophore with structural formula as formula (1) (R1 is nitro group, 2-(5, 5-dimethyl cyclohexene-2-alkyl subunit) malononitrile or 2-(3- nitrile radicals-5, 5- bimethylfuran-2(5H)-alkyl subunit) malononitrile, R2 is methyl or ethyl) which comprises the following steps: proceeding addition reaction of cinnamenyl azochromophore with hydroxyl group and isocyanate group propyl triethoxy silane to produce siloxane priority. The invention can form inorganic-organic hybridization material with organic chromophore, which can be applied in the electrooptical modulation, data storing and optical communication domain.