The design of the antenna beam angle and the installation layout of sun-synchronous orbit satellites with the three-axis stabilized sun oriented attitude were put forward. And the antenna beam design and its layout scheme for obtaining the maximum data transmission time to the ground station were proposed. According to the orbit design scheme of the scientific observation satellite, a data transmission antenna pointing to specified ground station antenna beam-pointing simulation model was established. By using the satellite toolkit STK simulation software, the effect of various antenna beam angle schemes and the antenna installation orientation on the data transmission time were simulated and analyzed, the different regularities about the time of data transmission for the satellites of pointing to solar and earth station were discovered. According to the relationship between the satellite-borne data transmission capability and the different antenna beam width, the optimal antenna beam width for data transmission was obtained, which provides a design basis for the beam design and installation of this kind of satellite.