The thermal decomposition behavior of unsymmetrical dimethylhydrazine (UDMH) oxalate was studied using differential scanning calorimetry (DSC), thermogravimetric analysis (TG/DTG), and thermogravimetric analysis combined with infrared spectroscopy (TG-IR). The endothermic decomposition of UDMH oxalate occurred at temperatures between 180.4 degrees C and 217.6 degrees C, the maximum decomposition temperature is 199.2 degrees C. The kinetic parameters of the decomposition reaction were calculated based on the Kissinger equation. The TG-IR spectra indicated that the thermal main decomposition products of UDMH oxalate are CO2,H2O and NH3.