To provide a thin-type planting base body where tree plants can be planted; to provide a thin-type greening construction method for a soilless surface utilizing the base body; and to provide a method for constructing a thin-type greening system enabling planting of tree plants into the thin-type planting base body.

The thin-type planting base body is structured as follows: implanting a fixing body from the bottom plate surface of a thin-type planting box body toward the inside the box body; waterproofing the inner surface of the box body or internally installing a waterproof sheet so as to fit the inner surface of the box body; internally installing a rootproof sheet so as to fit the inner surface of the box body; spreading granular charcoal all over the rootproof sheet; laying thin-type planting base mats each obtained by wrapping a mixture comprising bark, peat-moss, charcoal, fertilizer, soil improvement material, or the like, with a nonwoven fabric or a net sheet so as to be piled up on the spread-over granular charcoal; putting a fixing wire net on the mats; and uniformly spreading planting soil on the net together with water so that the soil is integrated with the planting base material in the planting base mats. The thin-type greening system construction method comprises planting plants such as flowering plants, fern, moss, grass and/or trees on the surface of the thin-type planting base body.