Abstract: In order to improve the adaptability of rockets under the condition of operationally responsiveness and emergency launch of launch vehicles, the flight trajectory planning of launch vehicles is studied in face of the possible shortage of tracking telemetry and command (TT&C) resources. For ground-based TT&C system, the available TT&C arc is taken as the optimization target, and the rocket flight procedure and trajectory are optimized with the prerequisite of carrying capacity and safe landing area. For a space-based TT&C system, an optimal communication link is established by designing a reasonable program angle to make the TT&C antenna pointing optimal. The above method improves the utilization efficiency of TT&C resources and effectively expands the TT&C arc. Simulation results show the effectiveness of the proposed method, which provides a theoretical guidance for the trajectory planning of a launch vehicle under the condition of insufficient TT&C resources.