Unpowered gliding cargo box lacks real-time decoupling control over altitude and velocity, making it challenging to achieve smooth transitions in multi-segment guidance trajectories between position and velocity constraints. This paper addresses the position and velocity constraints within the energy window constraints at touchdown by integrating both control objectives across the entire flight segment for comprehensive energy regulation. The proposed design achieves a guidance trajectory that satisfies high-precision position and velocity constraints, enabling the gliding cargo box to smoothly transition into the flare phase without excessive maneuvering or energy-consuming adjustments. This approach reduces the maneuvering requirements for weakly actuated cargo boxes from a trajectory design perspective, enhancing delivery accuracy and efficiency.