Abstract: The self-association of isomeric butanols in carbon tetrachloride, n-heptane, benzene and 1,2-dichloroethane has been studied by infrared sprectrometry in the range of 3800-3000 cm~(-1). It has been found that the area ratios of polymer band to monomer band are related to the characteristics of the solutes and solvents, and the plots of the ratios against mass percent of the alcohol show od linear relation in the measured concentration range. The IR data have also been treated by use of 1-n (cyclic) association models. According to the results obtained, branched chain causes a decrease in some extent of the self-association. In addition, the specific interaction between isomeric butanols and benzene or 1,2-dichloroethane leads to much less self-association of butanols. In diluted solutions, butanol molecules mainly exist in the form of monomer-dimer in benzene and 1,2-dichloroethane, and of monomer-trimer in carbon tetrachloride. In heptane, however, the monomer-tetramer for n-butanol and the monomer-trimer for the other butanols may be the best models accounting for the IR data.