The condition of the immune system in 56 patients with deep thermal damage was analysed according to the method of treatment; 30 patients were treated by the traditional bandage method, 26 patients--by the open method in bed with an air cushion of the" Klinitron" type. The study showed that the introduction of beds with an air cushion into clinical practice creates the most favorable conditions for the organism's adaptation in extreme functional stress and facilitates earlier normalization of the immune status; increase of the number of" active" T lymphocytes and theophylline-resistant T lymphocytes (helpers), marked reduction of the number of theophylline-sensitive T lymphocytes (suppressors), decrease of the level of circulating immune complexes, and normalization of the immunoglobulin-E content. The positive dynamics of changes of the condition of the immune system occurred during the earlier regeneration processes and when the patients felt better.