Two types of flat slab are tested one having drop and another having no drop. Shape of openings-(circular, rectangular and square) having sizes of openings (500mm dia, 400mm x 500mm, 445mm x 445mm) respectively. Dimension of slab panel is (6000mmx 6000mm x 220mm) and the drop having size (3000mmx 3000mm). size of column – (500mmx 500mm). The provision of location of openings is at center of the slab panel. Software CSI Safe16 is used to analytically design and check the result. End result is based on punching shear value, deflection, Maximum shear force and maximum bending moment.