Aiming at the problem of control coupling caused by projectile rolling,the influence of projectile rolling on the control coupling of guided projectiles is studied by using multivariable frequency domain response theory,and a decoupling method is given.The transfer function model of the steering gear control system is deduced.The control coupling characteristics are analyzed,and it is found that when the projectile rotation speed is less than the critical angular velocity,the influence of the control coupling can be ignored.When the projectile rotation speed is greater than the critical angular velocity,the pre-installation decoupling,series compensation decoupling and rudder angle feedback decoupling are studied respectively.The simulation results show that:1) The three decoupling methods can all achieve decoupling effect;2) The pre-installation decoupling structure is simple and easy to implement,but it has low accuracy and is greatly affected by the frequency of the input signal,which is suitable for ordinary guided shells;and 3) The complexity of the series compensation decoupling method is lower than that of rudder declination feedback decoupling,and it does not need to obtain the rudder declination feedback signal,which is suitable for high-precision guided projectiles.