This study of changing the locations of  internal crack in medal of loaded simply supported beam by finite Element method (FEM) using of FE analysis software (ANSYS v.14.0) ,the results show that changing the locations of  crack along (Y-axis) for(1/2H,1/4H,3/4H) changing the values of fundamental frequency  and mod shapes of beam. It been found that the higher frequencies values at the  even frequencies, and the frequency increases as we approach the upper and lower beam where it is less for the first and second frequencies when the crack closer to the upper end and more at the remaining frequencies and this reflects the amount of energy absorbed in the crack