Dragon century magnesium plain board(usually called magnesium oxide board) is combined system of MGO, mgcl2 and H2O alkali agent. The stable magnesium colloid is reinforced by middle alkali glass fiber net and stuffed by light material then becomes new frameless decorative material. It has the features of light quality, strong intensity, little contraction, easy constructing. Especially the unique waterproof, fireproof, corrosion proof and plasticity are better than normally used wooden multisplint, paper surface plaster board.