The invention relates to fusion of 10-octyl-2,3,6,7,13,14,17,18-octa(alkoxy)-10H-bis-phenanthro[9,10-b:9',10'-h]
carbazole, substitution of a
carbazole-containing
discotic liquid crystal triad compound, and substitution of 9-octyl-2,7-di(3',4,4',5-
tetra(alkoxy)-[1,1'-
biphenyl]-9-yl)-9H
carbazole, wherein the compound has structures represented by general formulas (I), (II) and (III), R1 is an alkylchain of C6-C16, R2 is an
alkyl chain of C1-C16, the compound represented by the general formula (I) can be self-assembled into a hexagonal columnar
liquid crystal intermediate phase in a wide temperature range, and the compound represented by the general formula (II) can be self-assembled into a columnar
liquid crystal intermediate phase and a nematic phase within a certain temperature range. The invention further provides a preparation method of the structure represented by the general formulas (I), (II) and (III). The compound represented by the general formula (I) can be obtained by oxidizing and cyclizing the compound represented by the general formula (III) in FeCl3 molecules.