By using an LKB-2277 Bioactivity Monitor, we have deterthened the thermogenesis curves of two species of Brucellas arithmetic series growth. nom the thermogenesis curves, a thermokinetic equation as:could be established for bacterial arithmetic series growth in which the order of growth metabolism n=0. The mean specific rate constant of multiplication and the mean generation time G et al. were calculated. This model was compared with the exponentialmodel.