The thermal decomposition process of potassium 4,6-dinitro-7-hydroxy-7-hydrobenzofuroxanate (KDNBF) is studied by using DSC, TG-DTG and FT-IR techniques. The results show that the solid residue at 230 ℃ are RCOOK, KNCO, RNO₂ and KNO₃, and at 306 ℃ are KNC, RCOOK and KNO₃, respectively. The Arrhenius parameters of the decomposition reaction are calculated using Kissinger′s and Ozawa-Doyle′s method, indicating that the results obtained by the two methods agree well with each other and the Arrhenius equation of this reaction can be expressed by lnk = 45.2-192600/RT.