PURPOSE: To surely fix a vegetation zone and to improve germination rate even on a face of slope with unstable surface soil.

CONSTITUTION: On a face of slope 1, a liquid state binder, which can nodulize surface soil, for example, an emulsified binder in which acrylic ester resin is uniformly diffused in water is sprayed. After the sprayed binder has been dried, a vegetation zone 3 in which seeds and feeds are held is fixed to the face of slope 1. A net 10 is extended over the vegetation zone 3.