Long chain alkylamines were found to behavior as the thermotropic liquid crystals at a certain temperature range, that is, at 2765, 3874, 4777 and 5589°C, respectively, in laurylamine, mirystylamine, cetylamine and stearylamine. These liquid crystals were studied by means of DTA, IR spectroscopy, dielectric constant and microscopic observation. The mixtures of these two amines also were investigated.