Abstract: A lunar base supply method which enables supplying a base on a surface of the moon more easily than carrying materials from the earth to the moon and building the base on the surface of the moon. The lunar base supply method includes the steps of: (a) carrying materials to be used to build a structure to sky of the earth, and causing the materials to revolve along an orbit around the earth; (b) building the structure by using the materials on the orbit around the earth; and (c) moving the built structure from the orbit around the earth toward the moon, and causing the built structure to make a soft landing onto a surface of the moon and thereby to be available as a base.