and reduce the threshold voltage thereof thus enhancing the performance of the liquid crystal display a liquid crystal composition of comparative example 1 was provided by mixing 2 by weight of a liquid crystal compound a as shown below into a liquid crystal host containing cyanophenyl group the threshold voltage measurement of the liquid crystal composition of comparative example 1 was shown in table 1 a liquid crystal composition of comparative example 2 was provided by mixing 15 by weight of a liquid crystal compound b as shown below into a liquid crystal host containing cyanophenyl group the threshold voltage measurement of the liquid crystal composition of comparative example 2 was shown in table 1 a liquid crystal composition of comparative example 3 was provided by mixing 2 by weight of a liquid crystal compound c as shown below into a liquid crystal host containing cyanophenyl and ester groups the threshold voltage measurement of the liquid crystal composition of comparative example 3 was shown in table 1 the result of threshold voltage measurement for liquid crystal compositions as described in example 4 and comparative examples 1 to 3 are shown in table 1 as shown in table 1 the liquid crystal composition of example 4 containing high dielectric anisotropy liquid crystal compound of the invention can reduce the threshold voltage about 30 more than comparative examples 1 to 3 the liquid crystal compounds mixed into the compositions of comparative examples 1 to 3 are nitrogen containing heterocyclic derivatives and the maximum dielectric anisotropy thereof is 31 2 thus the maximum decrease of threshold voltage of the liquid crystal compositions can only achieve about 5 2 while the invention has been described by way of example and in.