Aerodynamic modeling and trajectory optimization in longitudinal direction of a type of morphing fixed-wing unmanned aerial vehicle (UAV) for perching maneuvers were investigated. The elevator was inefficient due to the low speed and high angle of attack in the later phase of perching maneuver. To solve this problem, a morphing UAV which could change the position of wing was developed. The indoor experiment was carried out, and the flight data was obtained by the motion capture system. Based on this and flat plate theory of aerodynamics, aerodynamic model and longitudinal dynamic mode were established. Using general pseudo-spectral optimization software (GPOPS) optimization tool to design the trajectory of the UAV model. The optimization results show that compared with conventional fixed wing UAVs, morphing parts can significantly improve the UAV's attitude control efficiency and maneuverability.