The present paper describes a new ELISA type immunoenzymatic method for the detection of antibodies directed against nDNA, dDNA, and double stranded RNA (poly A, poly U and poly l, poly C). The antigens are adsorbed on glass beads but as some nucleic acids are difficult to adsorb on glass beads, polylysine was used to bind the antigens to the beads. The beads were saturated with sheep serum to get rid possible unspecific bindings. The sera are diluted before use with PBS containing sheep serum. The rate of antinucleic acid antibodies is obtained by subtraction of OD with antigen from OD without antigen. The technique was applied to human sera from patients with various autoimmune diseases (mostly disseminated lupus erythematosus). There is a rather good correlation between the determinations of anti-nDNA antibodies obtained with the ELISA and with indirect IF on Crithidia Luciliae.