Abstract: Using the temperature data of 156 national assessment stations, 1282 regional assessment stations and 1411 regional non-assessment stations in Sichuan Province from August 1, 2019 to July 31, 2020, with the correlation coefficient, average error, root mean square error and other indicators, the applicability of the two sets of fusion products of CLDAS (5km×5km) and HRCLDAS (1km×1km) in Sichuan Province was evaluated. The results show that the two sets of fusion products had good correlation and had certain characteristics of daily and seasonal variation. The error value of fusion products in the afternoon was slightly larger than that in the rest of the time, and the representativeness was poor. The evaluation effect in winter was poor, and it was the underestimated value of negative average error. The terrain and altitude had a greater impact on fusion products. In areas with high altitude and large topographic fluctuation, the error value increased significantly. The evaluation effect in the middle of the basin was the best, with positive average errors. The north and southwest of the Basin and the Basin-Sanzhou transition zone were the second, showing a small underestimation of the negative average error. The evaluation effects in Sanzhou and Panzhihua were the worst, which were the underestimated value of large negative average error. The evaluation effects of 1km fusion products were significantly better than that of 5km fusion products in winter and in the areas with complex terrain.