The segmented mirror′s misadjustment of synthetic aperture optical system will cause serious influence，and the different directions′ misadjustment of the segment mirror have the different functional relationship to the whole system，and have the different tolerance.The key point is study the interference pattern of sub-mirrors and the wavefront and draw conclusion in the field of physical optics to get the trait and date of the misadjustment.Here we contrast three segmented aperture optical systems which have the different F number an aperture but the same structure，and analysis the position errors of submirrors of these three systems，and get the conclusion of how the position errors effect the systems′ imagining，and get the key points of design.