Under the limited resource conditions, earth observation for multi-target area is an important problem in space. craft orbit design and in-orbit mission planning. The full effectiveness of each satellite is based on scientific design of the sat.ellite constellation. Around the multi-target area and multi-orbit constellation design problem, firstly, the orbit type and de.sign variables are determined in conjunction with the actual ability of the carrier. Then, according to the orbit extrapolation,point trajectory and detection area algorithm, the revisiting time calculation method is proposed. With the maximum revisit.ing time as the constellation design performance index, the constellation design is implemented using multi-layer nested vari.able search method. Finally, an example task is designed to show that the proposed constellation design method can find theconstellation to meet the index requirements, and it is feasible.