An integrated aircraft/scramjet reference trajectory design method for ABHV was proposed. The influence on starlight navigation was analyzed. First, based on the characteristics of intricate coupling for hypersonic airbreathing vehicle and combined with the characters of starlight navigation system, minimizing the coupling degree between aircraft and scramjet was referred to as the optimization index. Second, considering multiple constraints of angle of attack, fuel equivalent ratio, angle of attack rate, shock train axial relative length, a smooth solution for multiple constrained optimal problems was adopted. Then, a reference trajectory which is good for starlight system was designed, and the degradation of navigation performance under this trajectory was analyzed. The trajectory design method can further tap the potential of the overall performance indicators with core competitiveness, such as scramjet stability and aircraft high-precision strike. Taking an ABHV as example, the simulation analysis was carried out on the basis of accurate simulation model. The simulation results show that the method is effective and reliable.