Abstract: The gravity gradient torque of Chang’e5T spacecraft is analyzed during surrounding the EarthMoon. Based on the analysis, the actual quality characteristic is acquired via utilizing the onorbit data. A method of bias attitude in pitch is also designed to achieve the attitude of gravity gradient trim. The onorbit flight proves that the method can reduce the gravity gradient of the spacecraft and extend the unloading period.

Key words: gravity gradient, momentum management;trim attitude