This invention relates to liquid crystal stuff, includes several polymerizing monomer as well as several liquid crystal molecule. Liquid crystal molecule is select from at least one kind of compound 1, 2, 3, 4, 5, 6. The G1, G3 and G5 independently are alkyl that possess 1 to 8 carbon atoms or alkynyl that possess 2 to 8 carbon atoms. G2 and G6 independently are alkyl that possess 1 to 8 carbon atoms or alkoxy that possess 1 to 7 carbon atoms. G4 i alkyl with 1 to 8 carbon atoms, alkynyl with 2 to 8 carbon atoms or alkoxy with 1 to 7 carbon atoms. Z1 is single bond, ethylene group or methoxylgroup. Z2 is single bond, ethylene group, methoxyl group or carboxyl. Z3 is single bond, ethylene group, difluoro methoxyl group, difluoro propoxy or oxygen carbo- ethyl. Z4 is single bond, ethylene group, difluoro methoxyl group or difluoro propoxy. Formula 7 is 1, 4 - cyclohexenyl or 1, 4 - phenylene group. One of E1 and E2 is fluorine, the other is chlorine.