In order to acquire the ablation properties of carbon/quartz composites,the ablation experiment was carried out under the condition of different stagnation pressures,different heat flux and different total enthalpy using the arcing heater and carbon/quartz flat head stagnation model in this paper.Based on the experimental data, the mathematical model between mass ablation rate and the three major factors,namely heat flux,stagnation pressure and total enthalpy is established by using multiple regression analysis method,and the rationality of the model was tested. The results show that the established three-parameter mathematical model has a good fitting degree to the experimental data,and the heat flux is the most relative parameter.Compared with the single-parameter and two-parameter mathematical models,the three-parameter mathematical model has a better fitting effect on the experimental data and can better reflect the ablation properties of the carbon/quartz heat-resistant composites.