  We present a theoretical study of ghost imaging by using blackbody radiation
source. A Gaussian thin lens equation for the ghost imaging, which depends on
both paths, is derived. The dependences of the visibility and quality of the
image on the transverse size and temperature of the blackbody are studied. The
main differences between the ghost imaging by using the blackbody radiation and
by using the entangled photon pairs are image-forming equation, and the
visibility and quality of the image
