In this study we give a brief description of numerical results on Korenblum's conjecture for polynomials. The Korenblum's constant will be found out numerically by using different numerical integration methods and some methods for solving roots. It can be solved easily a little bit for Korenblum's conjecture under polynomials. Finally, we consider Korenblum's conjecture for some kinds of fractional functions and obtain a better upper bound of Korenblum's constant.