The utility model discloses a bottom plate for concrete assembled basis, radial evenly distributed is personally submitted to this bottom plate upper end has the multiunit girt strip, the distance at every group girt strip to bottom plate center is the same. The utility model discloses bottom plate simple structure, the mill's prefabrication of being convenient for, and can effectively improve assembly efficiency, prevented because the puzzlement that causes is cast for foundation ditch excavation, bed course to foundation ditch bottom surface unevenness.