According to the present invention, an artificial soil, which has compound effects, and is used in a wide range, and is easy to handle, is obtained by mixing Shirasu, fine particles of fossils, pulverized organic materials and soil-aggregating agent powders, and a construction of a bed soil for a putting green having excellent drainage and water-holding property and fertilizer-holding property is obtained by forming the bed soil of an upper growth layer formed of the artificial soil formed of a mixture comprising Shirasu, fine particles of fossils, pulverized organic materials and soil-aggregating agent powders, sands and soils and a lower drainage-layer formed of sands or mainly comprising sands.