Beam aperture and space array in ICF target area are researched. Based upon the geometrical space required by the machining design of the reflector module in target chamber as well as the special requirements of large aperture and alignment devices,the relationship between beam aperture and space alignment in ICF target area,which is suitable for the general technical requirement of SG-ш,facility is discussed.The equation that Δ_ vertical and Δ_ horizontal should satisfy is derived.