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This paper deals with the problem of sharp observability inequality for the 1-D plate equation wtt + wxxxx + q(t,x)w =0 with two types of boundary conditions w =wxx =0 or w =wx =0,and q(t,x) being a suitable potential.The author shows that the sharp observability constant is of order exp(C‖q‖2/7∞) for ‖q‖∞≥ 1.The main tools to derive the desired observability inequalities are the global Carleman inequalities,based on a new point wise inequality for the fourth order plate operator.