A new calculation method is developed to evaluate the heat transfer parameters based on the experimental data in the fixed bed reactor and a temperature profile function is also obtained. The surface spline function is used to express the temperature profile. The Gauss complete pivoting is adopted to solve the system of linear equations and the simplex method is introduced to calculate the objective function. The calculation results by this method accord with the literature data. Some other advantages of this method

such as good stability

wide adcptive range of initial value are discussed.