根据热动力学基本理论 ,建立了简单级数反应热动力学对比参量方程 ,提出了一种确定反应速率常数的方法——半寿期法 .该法只需要特征时间参量 tm 及相应的热谱数据便可方便地计算化学反应的半寿期和速率常数 .通过几个简单级数反应体系的热动力学研究 ,验证了半寿期法的正确性 . According to the basic theory of thermodynamics, the thermodynamic parameters of simple series reaction were established, and a half-life method was proposed to determine the reaction rate constants. The method only needs the characteristic time parameter tm and the corresponding heat spectrum The half-life and the rate constants of the chemical reactions can be easily calculated by the data.The thermodynamics of several simple series reaction systems verify the correctness of the half-life method.