Abstract: By now，f（α）=（1-α）ⁿ（usually n=1）has been adopted as reaction mechanism function in most research on pyrolysis kinetic model of municipal solid waste(MSW) components.In order to clarify the error of the model prediction，experimental studies on pyrolysis kinetics of PE，PVC，latex glove，inner tube of bicycle tyre,outer cover of bicycle tyre，cloth，watermelon peel，double-faced printing paper and fish bone were performed with the thermogravimetry analyzer.Using the common twenty mechanism functions of kinetic models，the experimental results of each sample were simulated respectively，and the optimal models were chosen，then the calculated results of the optimal model were compared with those of the model based on reaction mechanism of f（α）=1-α.The results show that the kinetic model based on f（α）=1-α reaction mechanism is not the optimal pyrolysis model except for PE，and a relative by large error even exists in certain temperature regions for some samples.