According to the Reusable Launch Vehicle (RLV) is unpowered and with low lifttodrag ratio during Terminal Area Energy Management phase (TAEM), this paper studies a new trajectory design method based on number of trajectory. At first, this paper establishes 3DOF model of the sample RLV for trajectory design and simulation. Next, considering the flight task of TAEM, this paper design the flight corridor to express the restriction and also design the trajectory based on heightfly distance. Then, the trajectory database was built. At last, the nonlinear simulation environment is built in the MATLAB environment. The results show that the trajectory online selection is reasonable and the trajectory is robust.