The coupled relation between the influence of the radom to the antenna phase center and the elevation angles is studied in this paper. The influence of the same radom to the relative positioning and precision point positioning (PPP) at different elevation angles and that the different radom to the relative positioning and PPP at the same elevation angle are compared and analyzed. Results show, when the variation of the antenna phase center is 5°, the influence of the radom to the antenna phase center has a positive coupled relation to the elevation angle. There is little difference between the influences of the same radom to the positioning at different elevation angles. However, in case of the same elevation angle, the influences of different radom to the relative positioning and PPP results can reach up to 6mm and 13mm respectively in the elevation direction.