Practical design considerations for a high off-boresight launch missile tracking seeker is presented, which is gimbaled with respect to the missile to allow target acquisition and tracking. In this paper, three tracking seeker component imperfections, such as stabilization loop gain variety, gyro acceleration sensitivity and coupling of the body movement, are discussed. The stability issues and miss distance caused by these imperfections are analyzed by using simulation. This paper has theory reference significance to the engineering design of tracking seeker system.