The Point Spread Function(PSF) is a typical analytical method of traditional imaging. Using it for reference, the theory of Correlated Imaging(GI) was re-deduced and the PSF of Ghost Image(GI) was derived. Based on this theory, the PSF and GI formula were derived when turbulent was considered in optical paths. Finally, numerical simulation was done and the result indicates that GI process can be described by PSF properly. The variation caused by distance, source size and turbulence intensity can be quantitatively analyzed.