The thermooxidative degradation of natural rubber (NR) coagulated by microwave radiation (NR-m) was investigated by thermogravimetry (TG) analysis, and compared with NR coagulated by acid (NR-a). It was found that the degradation process is not a one-step reaction, the main degradation process occurs at 300 -400 ° C, and the equilibrium degradation temperatures of NR-m are higher than those of NR-a. Different methods were used to find the most probable kinetic model and the Arrhenius para meters (activation energy E and preexponential factor A ) for the main stage of thermooxidative degradation of NR-m. The results show that the values of E and A , obtained from the Coats-Redfern method, are highly variable with the kinetic model chosen and the heating rate ( β ), and the apparent activation energy ( E 0 ) when β approaches zero for the D n type kinetic model is in the range of 96.7 -106.4 kJ · mol -1 . The mean values of E , calculated by the Friedman and Flynn-Wall-Ozawa (FWO) methods, are 113.8 and 83.3 kJ · mol -1 , respectively, suggesting E in the range of 83.3 -113.8 kJ · mol -1 . Comparison of these two ranges indicates the most probable kinetic model to be D n type kinetic models, corresponding to a diffusion-controlled mechanism.