The new generation air-to-air missile for short range dogfight has the characteristics of high maneuverability and high guidance precision which can be used as shipborad short range antimissile missile.A 3-DOF mathematical model of the vertical-launched missile was built up.In order to solve the problem of detection and guidance when a short range dogfight air-to-air missile is used to intercept anti-ship missile a practical guidance method was proposed.Using the target direction information a virtual target that moved on the detection line was introduced to guide the vertical-launched missile to fly to the target by the proportion guidance law.In approaching process the IR seeker could capture the weak and small infrared target stably and then change to the terminal guidance state in time.Finally an intercept simulation with the 3-DOF mathematical model illustrates the effectiveness of the guidance method.