In order to improve the safety of formation flight， a method using wingtip normal blowing is proposed to weaken the influence of the wake generated by the leading aircraft. Numerical simulation methods are employed to analyze the aerodynamic characteristics of the following aircraft affected by the wake of the leading aircraft during different formation positions. Additionally， numerical simulation is conducted on the wingtip normal blowing. The simulation results indicate that during formation flight， the following aircraft experiences significant disturbance torque when transiting laterally through the vortex area of the leading aircraft， which increases the difficulty of rudder manipulation and aircraft control， posing a serious threat to the safety of the following aircraft. After introducing wingtip normal blowing， the wingtip vortex of the following aircraft is weakened， and the lift-to-drag ratio increases with the augmentation of the blowing momentum coefficient. Subsequently， a formation flight control system with wingtip normal blowing is established in Simulink for simulation. The simulation results demonstrate that the proposed wingtip normal blowing mitigates the influence of the wake from the leading aircraft， reducing both the lateral position and velocity deviations of the following aircraft as it traverses the vortex area of the leading aircraft. Concurrently， the aileron deflection of the following aircraft is significantly decreased， thereby improving the safety of the following aircraft.