The kinetics parameters of the th ermal decomposition of boric acid have been investigated by using TGA data. Suzuki and Coats-Redfern methods have been applied for the kinetic investigation. It was determined that decomposition kinetics of bone acid occurred in two steps and both regions suitably fit a first-order kinetic model. According to Coats-Redfern method, the activation energy and frequency factor were found as 79.85 kJ center dot mol(-1) and 3.82 x 10(4) min(-1) for region I and 4.79 kJ center dot mol(-1) and 4.045 X 10(-5) min(-1) for region II, respectively. The activation energies and frequency factors were found as 4.45 kJ center dot mol(-1) and 4.08 x 10(8) min(-1) for the Suzuki method.