| As the great benefits of UAV(unmanned aircraft vehicle) been known in the fields of military and civilian, people pay more attantion in the UAV. Under many conditions, the recovery of UAV is necessary, so the control of automatic landing improved greatly.On the basis of usual flight control, a practicable control strategy is designed to meet a certain UAV model, which considered the characteristic in the phase of landing.Different control laws are designed throught classic control theory. Modern control theory is used to optimize the gains.Emulations are made to prove the control law are feasible. |