FY-3D VASS （Vertical Atmospheric Sounding System） atmospheric temperature and humidity profile products are evaluated using radiosonde observations and ERA5 reanalysis dataset at Sichuan Basin and western Sichuan Plateau. The results show that relative to ERA5 data, the average bias of FY-3D/VASS temperature in different seasons is -0.631~0.500 ℃ and -2.230~-1.234 ℃ and the root mean square error is 2.117~3.222 ℃ and 3.077~3.460 ℃ at the basin and the plateau area respectively. Vertically, the accuracy of temperature is low at 800~700 hPa at the basin area and gradually decreases as the height decreases at the plateau area. The average bias of FY-3D/VASS specific humidity relative to ERA5 is generally negative, while the average bias in different seasons is 0.775~-0.525 g·kg-1 and -1.096~-0.347 g·kg-1 and the root mean square error is 1.251~2.367 g·kg-1and 0.696~1.991 g·kg-1 at the basin and the plateau area, respectively. The accuracy of specific humidity is relatively low at 700~600 hPa. In consideration of the small diurnal difference in the accuracy of FY-3D/VASS temperature and humidity, the average bias of the two groups of evaluations is properly added. As a result, the average bias of FY-3D/VASS temperature and specific humidity can be indirectly obtained based on the radiosonde observations. Relative to radiosonde observations, the average bias of FY-3D/VASS temperature at the basin area is relatively small and the average bias at the plateau area is about -2.440 ℃. The average bias of FY-3D/VASS specific humidity at the basin and plateau area is about 0.612 g·kg-1. The above-mentioned results are significant for improving the weather and climate application ability of FY-3D/VASS temperature and humidity profile products at Sichuan Basin and western Sichuan Plateau.