Abstract: The high-temperature liquid crystals p-biphenylene bis-(p-n-alkoxy-benzoate) homologs, in which alkyl group is propyl, butyl, amyl, hexyl, heptyl and nonyl, have been used as stationary phases for gas-liquid chromatographic separation of ph'enanthrene, anthracene and car-bazole. For comparsion some conventional liquid phases such as OV-101, OV-25, OV-210, OV-225 and Versamide-930 were studied as well.To find some better liquid phases relative retention was determined on 0.5m columns packed with these stationary phases. It is found that BPBBB (with Butyl group) and BPBAmB (with Amyl group) are better to separate the mixture of phenanthrene, anthracene and carbazole. On a 0.5m column packed with the liquid crystal BPBAmBon Chromosorb W NAW, the mixture can be separated satisfactorily within 16 minutes.