Optical sparse-aperture system can be designed to obtain high resolution in astronomical object imaging with several.Maximal and minimum fill factors of the sparse-aperture systems are presented,with the examples of annulus,Golay6 and tri-arm.A novel model named sparse-aperture multiple-array system is also proposed,and three kinds of configuration models have been illustrated.We compare the imaging performance of different multiple-array configurations by using the modulation transfer function(MTF).The results show that the variety of space between sub-aperture and the rotation of sub-array of multiple-array configurations have the effects on multiple-array MTF,and the multiple-array configurations have te advantages of firm configuration and easy fabrication.