TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): An ion liquid crystal compound of imidazole and cholesterol ester is prepared by dissolving triethylamine and cholesterol ester in tetrahydrofuran, dropping fatty acyl chloride into tetrahydrofuran solution under condition of stirring, reacting at normal temperature and for 1-2 hours, refluxing at 65 degrees C and reacting for 8-32, distilling 2/3 volume of tetrahydrofuran, cooling reaction residual solution to room temperature and poured into 5-10 times the volume of water, adjusting pH value to 3-4 by diluted hydrochloric acid, washing filter cake thrice with water, and recrystallizing filter cake by acetone to obtain liquid crystal intermediate, dissolving liquid crystal intermediate in acetone to obtain solution I, dissolving 1-alkylimidazole in acetone to obtain solution II, adding solution I into solution II under blending condition, heating to 60-65 degrees C and reacting for 0.5-1 hour, and decompressing and distilling to remove acetone in which amount of tetrahydrofuran dissolves reaction raw material as standard control, mole ratio cholesterol ester:fatty acyl chloride:triethylamine is 1:(1-2):(1-5), volume-to-mole ratio acetone:liquid crystal intermediate is (5-10) ml/mmol, and volume-to-mole ratio acetone:1-alkylimidazole is (1-5) ml/mmol. Preferred Component: Fatty acyl chloride consists of chloroacetyl chloride, bromoacetyl chloride, 2-chlorpromazine chloride, 2-bromopropionyl chloride, 3-chlorpromazine chloride, 3-bromopropionyl chloride, 2-chlorobutyryl chloride, 2-bromobutyl chloride, 4-chlorobutyryl chloride, 4-bromobutyl chloride, 5-chloropentanoyl chloride, 5-bromopentanoyl chloride, 6-chlorhexidine chloride, or 6-bromohexanoyl chloride. 1-alkylimidazole consists of 1-methylimidazole, 1-ethylimidazole, 1-propylimidazole, 1-isopropoxylimidazole-1-butylimidazole, 1-pentylimidazole, or 1-hexylimidazole. Preferred Parameter: Dripping speed is 5-10 ml/minute, and stirring speed is 200-300 rpm. Preferred Process: An ion liquid crystal compound of imidazole and cholesterol ester is prepared by heating recrystallized material into acetone to dissolve and cooling for greater than or equal to 1 hour in which amount of acetone is 1-3 times the volume of recrystallized material.