Ethyl α-cyano-4-hydroxycinnamate was synthesized by 4-hydroxybenzaldehyde and ethyl cyanoa-cetate. Four ester liquid crystal compounds were synthesized by four chloride and ethyl α-cyano-4-hydroxycinnamate. 4-propylphenol α-cyano-4-hydroxycinnamate was synthesized by 4-hydroxybenzaldehyde and 4-propylphenol cyanoacetate. Two ester liquid crystal compounds were synthesized by two alkyl-cyclohexyl carbonyl chloride and 4-propylphenolα-cyano-4-hydroxycinnamate. All the compounds were characterized by MS

and their phase transition temperatures were measured by DSC. Ultraviolet absorption spectra of them were measured by UV spectrophotometer. Their properties of anti-UV in the liquid crystal mixtures were studied. The result shows that such compounds can be added to liquid crystal mixtures as UV absorbent

thus improving liquid crystal mixtures anti-UV properties.