Abstract: An improved structure of an assembly type floor or wall tile includes a face layer of stone or wooden material, and a bottom layer of plastic, which are injection molded and bonded integrally so that they will not disengage, and the stone face layer is not vulnerable to breaking. Besides, the present invention has the features of dampness and fire resistance, material savings, reduced costs, lightness, and easy transport. Besides, the periphery of the bottom layer is provided with projecting and indented retaining posts, the bottom side thereof being formed with a plurality of grooves that have a circular, square or any suitable shape, and that are narrow at the opening and wide at the bottom. The retaining posts are for assembly purposes to facilitate construction and permit repair and replacement. The grooves in the bottom side has the effects of shock-absorbing, ventilation, reinforced structure, plastic material savings, and lightness.