PURPOSE: A method of greening a cutting area or a filled area necessary for artificial vegetation comprising manufacture steps of a forest topsoil composition having the same composition and characteristics as natural topsoil layer present in a forest and then construction of a forest topsoil layer using the forest topsoil composition is provided. It promotes environmental restoration and gives optimum growing conditions for growth of plant seed. CONSTITUTION: The forest topsoil composition is prepared by mixing 5 to 15kg water to 1kg forest topsoil component and then adding 1 to 5kg soil stabilizer thereto. The forest topsoil component contains 10 to 30kg pumice, 25 to 40kg decomposed manure, 15 to 25kg decomposed wood chips, 5 to 15kg coconut coir pith, 1 to 5kg perlite, 5 to 10kg peat moss, 15 to 25kg peat, 10 to 20kg ferrite, 10 to 20kg fly ash, 5 to 15kg charcoal powder, 0.5 to 1.0kg sodium alginate and 0.5 to 1.0kg wood vinegar. In the afforestation method, a plant seed(20) is sprinkled on a lateral roots layer(12) of plants coated on an uppermost layer(10), several coating layers are formed thereon. The several coating layers comprise a root expansion layer(11), the lateral roots layer of plants, a seed position layer(13) and a grass mulching layer(14).
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