PURPOSE: A gypsum board assembly is provided to improve gypsum board adhesive force and satisfy the fire-resistance efficiency management reference of a high-strength concrete post. CONSTITUTION: A gypsum board assembly(1) comprises a first gypsum board(3), a plate, a second gypsum board(7), and a fixing member(9). The first gypsum board is attached on the bond for a gypsum board to surround a concrete column(2). The plate is fixed to the first gypsum board along the longitudinal direction of the concrete column. The second gypsum board is placed to surround the first gypsum board and the plate. The fixing member fixes the first gypsum board and the second gypsum board around the concrete column.
