TT&C communication link of sun pointing satellite in sun-synchronous orbit is easy to be interrupted due to the gain pattern interference area of the satellite’s TT&C antennas which are placed in traditional way. In order to reduce this kind of communication link interruption, the antennas’ placement on the satellite should be optimized by taking advantage of the characteristic that the orbital plane of the sun-synchronous orbit and the solar vector maintain a relatively fixed. In this paper, the concrete realization process of TT&C antennas’ placement for sun pointing satellite in sun-synchronous orbit is given through a simulation example, and the recommended installation angle of the TT&C antennas for sun pointing satellites in different sun-synchronous orbit are also provided as a reference.