Abstract: AIM To study Thermal stabilities and thermal decomposition process of ribavirin and establish thermal decomposition kinetics equation. METHODS Thermal weight loss curve was obtained by thermogravimetry balance. Thermal decomposition function mode was also determined by Achar differential method and Coats-Redfern integral method. RESULTS Thermal decomposition kinetics parameters and kinetics compensation parameters were calculated from thermogravimetry differential thermogravimetry data. Activation energy deduced by extrapolation under heating rate of 0℃·min^-1 was 188 04 kJ·mol^-1. Thermal decomposition kinetics function expression was dα/dt=Ae-Ea/RT(1-α)² and the mathematic expression of the kinetic compensation effect is found to be ln=0.2264Ea-5.4458. CONCLUSION Ribavirin has high thermal stability because of its high thermal decomposition activation energy. The thermal decomposition activation of capsule is little lower than that of material,which indicates no evident difference in thermal stability for capsules and material.