In order to reduce the influence of direct solar radiation, scattered solar radiation and reflected solar radiation on the temperature sensors in existing weather stations, a multi tube spherical radiation shield is designed in this paper. Firstly, the shape structure of the radiation shield is designed; Then, Computational Fluid Dynamics method is used to quantify the radiation error of the sensor under different environmental parameters such as wind speed, solar radiation intensity and solar altitude angle; Then, Support Vector Machine algorithm is used to train the prediction model; Finally, the radiation shielding effect and the prediction accuracy of the algorithm are verified by using the external field radiation error experimental platform. The experimental results show that the accuracy of radiation error can be reduced to the order of 0.05 ℃. It can be seen that the radiation shield has remarkable effect in reducing radiation.