Various solution methods have been introduced for the solution of flat plate structures under horizontal and vertical loads. In this study, interrelations of all the columns on one storey have been examined. Therefore unit moment has been successively applied to each of these columns and unit moments carried over the other columns have been found. In addition, fixed-end moment factors on the columns arising due to vertical load were also calculated. Then citing slope-deflection equations to which these results could be applied, some examples of moment and horizontal equilibrium equations have been given.