Abstract: The calcined product of the high-level liquid waste(HLLW) is the intermediate product of two-step cold crucible glass solidification process. Its performance(such as water content, bulk density, denitration efficiency and so on) has an important impact on the process control of the whole system and glass product quality. Generally, the factors affecting the performance of calcined products include: the heating temperature of rotary calciner, the inclination angle of furnace body, the rotation speed of furnace body, the composition of simulated waste liquid, etc. In order to obtain the influence degree of different calcined products on their performance, the Gauss Kriging(GP) surrogate model is used to calculate and analyze the influence factors on the experimental data of the transformation process carried out on the bench for the simulated HLLW of spent fuel with burnup of 33 GW·d/t U and 45 GW·d/t U. The results show that the main influencing factor seqencing of the bulk density of calcined products under the experimental conditions is the composition of simulated liquid waste>the angle of furnace body>the rotation speed, and the main influencing factor seqencing of water content is the angle of furnace body> the composition of simulated liquid waste> the rotation speed. At the same time, the established proxy model is used to predict the water content and bulk density of calcined products produced by four heating temperatures, five inclination gradients and two simulated waste liquid component tests in the high-level waste liquid transformation test. It shows that is more suitable for the performance of calcined products, as the heating temperature in the first two areas between 540-680  ℃, and the angle of furnace body with 3%. Therefore, the method of identifying the factors affecting the performance of calcined products by agent model method is feasible, and can provide basic data and technical support for the optimization process.