The structures of multi-axis consistency testing systems of aiming line and gun bore line are introduced. The concepts of expanding systems are referred. The design methods of expanding lens systems are described. According to dynamic optics theory, the alternative schemes of expanding lens are analyzed and compared. The precision of testing systems whether can meet the requirement in large field of view is verified which includes the errors of collimators, aiming line and TV cameras and the errors generated in optical observation mirrors, infrared cameras, laser rangefinders, gun bore line and collimators.