Due to the increasing amount of attention that has been focused on numerical weather forecast and climate change research

it is desired that the observation precision of sounding temperature sensor can reach 0.1K.To achieve this goal

computational fluid dynamics（CFD）method is used to carry out numerical analysis on solar radiation errors of whole process of bead thermistor from sea level to 32 km altitude.On the basis

aiming at various lead

lead angles

and sun angles

that affect measurement precision are analyzed.The results show that lead

lead angle and sun angle are important factors which affects error.With the increase of elevation from sea level

the solar radiation error appears to be an exponential function correlation with altitude

which exhibits a growing slope rate.