In response to wide-speed-range aircraft tasks in near-space, engine performance’s significance and integrated flight/propulsion control strategies are explored. A model of the wide-speed-range aircraft is constructed, including intake modeling influenced by flight attitudes and engine modeling. Subsequently, addressing challenges posed by various power modes and power transitions, a flexible power conversion strategy is devised. Building upon this, an integrated flight/propulsion control strategy adaptable to different flight environments is proposed. To optimize the climb trajectory of the aircraft, the pigeon-inspired optimization (PIO) algorithm is introduced to search for multi-constrained trajectories, thereby achieving trajectory optimization for climbing. The experimental results demonstrate that the proposed integrated flight/propulsion control strategy is effective in dealing with multiple power modes and power transitions, while the optimized climb trajectory meets the performance requirements of the aircraft., while the optimized climb trajectory meets the performance requirements of the aircraft.