Under high temperature heating condition,calculation result of the temperature profile of the the polytetrafluoroethylene was effect by the dynamic ablation pyrolysis greatly.To improve the computing precision of the temprature profile,the method for computing the ablation temperature field for polytetrafluoroethylene has been set up,which has been tested by the thermal response charactericstic of the polytetrafluoroethylene under arc heater high temperature environment.By comparing the theoretical and the experimental results under arc heater high temperature environment,the results show that the temperature increases with the time passes during 230 ℃ to 323 ℃ temperature rising zone. The theoretical result changes in the same tendency with the experimental result.During 323 ℃ to 680 ℃ temperature rising zone,the temperature of experiment increases with the time passes.When the theoretical temperature is fixed,the theoretical result deviates from the experimental result.During 680 ℃ to 390 ℃ temperature reducing zone,the temperature of experiment decreases with the time passes.The theoretical temperature is higher than that of the experimental result. It is associated with the computing deviation of the ablative data.By using ablation temperature computing method, it can simulate the thermal response characteristics of the polytetrafluoroethylene under the arc heater high temperature environment effectively.It can provide reference for the design of products.