The Advanced Space-based Solar Observatory (ASO-S) is to be put in a sun synchronous orbit (SSO) with an altitude of about 720 km and an orbital period of about 99 minutes. The selection of such an altitude is a trade off the HXI requirement for lower particle background along the orbit and the LST requirement for low scattering light. It has an inclination angle of around 98.2 degree. The satellite will go through the shadow of the Earth between middle May and August with a maximum eclipse time of 18 minutes. The satellite is supposed to be launched with the CZ-2D rocket, which is capable of carrying 1000 kg mass into the orbit of 720 km. The spacecraft points to the Sun with the three axes stabilized.