Abstract: The principles of cross-shaped detector array and the infrared decoy are introduced. Seven kinds of antijamming methods,such as time correlated choice and field-of-view shrinkage, inertial track,real-time memory criterion,amplitude discrimination, pulse-width discrimination, pulse-amplitude time sequence discrimination and pulse-width amplitude discrimination for Counter-Infrared-Interference-Missile(CIRIM) with the cross-shaped detector array are given. The condition of the methods to be used is presented at last.