Name: Yuezhen Niu
 Institution: Department of Astronomy School of Physics
 Title: Cosmological Restrictions deducted to avoid a Black Hole Paradox
 Key Words: Shwarzschild radias  homogeneity  event horizon 
 Abstract: Black hole is always a tantalizing researching topic.Here we want to explore the implication of exact constrains deducted by studying black hole model in a homogeneous background universe. Surprisingly, we found out some interesting results similar to the Bekeinstein Bound on entropy. And quantum corrections are to be included in the future research.