To supply thick vegetation base materials for greening an inclined surface by connecting two face and rear woven fabrics of union cloth by warp and weft by joining threads arranged in the longitudinal and transverse directions to form a bag, pouring vegetation base materials inside thereof, and setting the mesh of the face side woven fabric to be coarser than that of the rear side woven fabric.

A face side woven fabric 10 and a rear side woven fabric 20 are connected to each other by joining threads which are arranged in the longitudinal and transverse directions with the prescribed intervals, and the arrangement interval is of appropriate ratio according to the mat thickness using the polyester thread same as the material of the woven fabric. The organic compost, fertile earth, soil conditioner, seeds of various kinds of grass, and necessary fertilizer are fully kneaded adding the kneading water thereto. The base material 2 is pressurized and poured by a pump vehicle form a vegetation base material pouring port provided in a part of a vegetation mat 1 which is worked to meet the topographic features of a slope. The ratio of the composition of the vegetation base material 2, and the kinds of plants are appropriately set according to the ground condition to be greened and the landscape obtained after greening. The vegetation mat 1 of uniform thickness is provided, and a highly stable vegetation base layer can be obtained with a rock or a bare ground.