Abstract: Based on orignal Reissner equation,in this paper,The general analytic solution forms of Reissner thick plates were presented according to the govering equations of reference 2.Based on it,bending problem of rectangular Reissner thick plates with four fixed sides under uniform load were also discussed,and designed a corresponding FORTRAN Program for VAX-8200. The analytic method given in this paper has the advantage of the superposition method in both mechanics concept and mathematics calculation.The results computed in this paper shows that its results is more correct,and its method is effective in practice.